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IITJEE 2015 : Doubts – Chapter 1, 2, 3, 4
Please raise your doubts as comments from first four chapters. We will have online problem solving classes soon.
-Manmohan Gupta
(VMC – IIT Preparations)
Categories: IITJEE 2015
Manmohan's Blog 
Please explain all the centres(orthodox,circum,in centre etc.)in details &the prop which we can exploit in co ordinate geometry.
1.) Bhaiya, can you please confirm the answer for Ch-2 INE -E ques 8 , answer is coming out to be mpi/2 but in solution booklet, it is given mpi.
2.) Can we represent a point having imaginary coordinates on cartesian plane . Also can we represent a circle with imaginary radius on cartesian plane ?
3.) Ch-3 INE-C ques 6 , if we see the options, (D) is correct.
Answer to your second questions is “No”. We cannot plot imaginary coordinates as well as circle on Cartesian plane.
sir ,one of the videos of straight lines is not opening
Which video? Can you mention the title/name of the video?
and i had doubt in Objective Worksheet q14 and INE D q7
in straight lines
bhaiya plz explain Q. no. 15 of OWS and plz tell that how do we decide btween obtuse and acute angle bisectors of two lines both of which pass through origin
bhaiya,
straight lines-
in ine-b,ques4,in solution ,they hv taken a case of external division also.but ques suggests that there is internal division.
in objective worksheet ,how is it possible that sum of distances is 0?but distance is always +ve.
in objective worksheet ques 14(alternate method),they hv taken new ordinate as 2(without being mentioned in the ques)
in objective worksheet ques 36,maybe the triangle is formed by the acute angle b/w the lines.
In q 36,obtuse angle will be formed, by seeing the slope of lines v can deduce this
ok
bhaiya can u plzz tell the group code for iithee 2013 as i am having some wrong group code….THANK YOU
*iitjee2015
given at vmc only
Ch2 .trig . – objective worksheet Ques no. 15 ,35 .!
have doubt in same questions
Bhaiya, can you please continue the MOF sessions again, they were really useful and most importantly we were always in touch with the older chapters.
-2014 student
Bhaiya for transformation of equations how to solve if the new roots are some combination of the old roots say new root = (sum of old roots) and other root = (difference of old roots)
PnC
INE – E –> Q9, Q16 (ans is not matching) Q17 (in video solution you have included 0 in total no. of digits but if 0 is included it will come in 1st place and it will be a 5 digit number -plz confirm) Q28, Q33 , Q35 b,c
OWS — > Q22 – can’t understand how to take constraints on variables defined in X1 + X2 = r in video solution, understood how to solve integral equation(if we select 0 objects from p alike and q objects from q alike, total objects selected are q which is less than r and X1 + X2 r )
sorry in Q 16 i want to confirm my answer ….what does in all possible ways mean here?…does it mean that we have to permutate also ???
ch1 ose q 54 and 55
Ch-3, Ill-44,47,35
OW: 4,14,33
CH-4 ILL-5(ALTERNATE), ILL-29
bhaiya, trigo is not yet completed in f1 can we give its doubt after 29.
rest doubts…
circles ;- ine B, Q-1 (iii) answer is not matching
Q7 a shorter soln.
ine c, Q-5 answer is not matching
objecive Q- 19, can we do it the other way without assuming random points
THANK U
straight lines objective worksheet ques no. 29
straight lines objective worksheet ques 29
straight lines objective worksheet q-29
Quadratic: Objective W.Sheet Q.54
Straight Lines: INE B, Q6(ii), Objective: Q4 (simplification part), Q35, Q41-43(paragraph)
Circles: INE C, Q18, Illustration 44, Illustraion 65 (how is PD=DA), is there a better method for Illustration 67?
Also, Circles, Objective Worksheet Q21, how do we get equation of line through A and orthocentre as x+y=13?
ch3-ows q14 (alt method),q33
Q33 is explained in one of the Straight Lines videos…
ch-2 ows q14 (alt method) ,q33
ch-2 q14(alt method),q 33
ch 3ows:q 14(alt method),q 33
ch 3 strt lines; ows;q 14(alt method),q 33
bhaiya in PnC problem solving video (Q-17 of INE-E) should’nt the answer be 11C6 instead of 12C6 ??
straight lines objective worksheet q 29.
ch 3 ,ows,q41,42,43
CH-1
# Pg 29 INE-C Q4 ans given is D but my answer is C plz tell where is the mistake
# Pg 22 INE -B Q 7
# OWS Q24 in solutions it is done in very lengthy way can we do it with TRANSFORMATIONS OF EQUATIONS
#OWS 35 why ans is C
CH-3
# Pg 17 INE – B Q16
# Pg 23 INE- C Q3
bhaiya plz explain homogenization of a circle again…what is its purpose…??
Homogenising a curve wrt a line gives equation of pair of lines joining origin to points of intersection of the curve and the line. Was used in a few questions to find angle subtended by chord of contact in the centre of the circle, as we can find angle between the lines from the equation of pair of lines.
ch 3: INE-B 6,9,13,15
INE C 7
INE D 7
CH4 : INE A 3
INE B 1(iii), 2(ii),v; 4,5,7,14,16,19
INE C 1,2,5,6,7,12,14,15
ILLLUS. 50 ; ILL-78
INE E-2,5
OW: 21, 28(if we solve by similarity we get (B) )
formula for image of a circle ??
how to use x^2 + y^2 + 2gx+c=0 in co-axial system ??
Do you have INE solutions?
No.
Bhaiya…. Please tell..these questions…
Chapter- Quadratic Equations-
Objective Worksheet- ques- 22
-ques- 26
-ques- 41
Bhaiya I really don’t understand in Q.33 , Quadratic equations and inequations , Objective Worksheet……that why do we ignore the denominator after taking the LCM…….at x=e , wont the denominator also become zero…..the whole expression then becomming not defined?
quadratic equations objective worksheet que-22,46,47
sir please tell these questions:
straight lines
1)page 16 INE-B Q-6 ii) (simplification)
2)page 33 illustration-45
3)page 34 illustration-47
4)page 38 OWS-14 (please explain how to solve question involving shifting of origin
Circle:
INE-D 5,10,15,16,17,18
sir please tell these questions:
straight lines
1)page 16 INE-B Q-6 ii) (simplification)
2)page 33 illustration-45
3)page 34 illustration-47
4)page 38 OWS-14 (please explain how to solve question involving shifting of origin
trigo – page 31 illustration 31
st line – page 31illustration 44
circle page 53 illustration 58
page 56 illustration 67
bhaiya trigo and circles illustration 58 is clear
bhaiya
please explain the new coordinates when rotation and translation of axis takes place together
sir can you tell what is centre of similitude and inverse of a point
in circles
st line OWS – 52 plz explain case 3 and case 4……is there any shorter way to solve the q compared to the solution of module
Straight line
INE B Q-6 ii) (simplification)
ILLUSTRATION 45 AND 47
OWS – 14 (Explain the concept of shifting of origin)
There are two illustrations with number 45. Which one you want me to discuss.
Illustration 45 on page 33
straight lines objective worksheet ques 33
circles objective worksheet ques 18
circles illustration 67
trigo. ows que – 15
trigo objective wrksheet ques 15
Bhaiya, Problem solving classes on straight lines (mainly, rotation of axes) and p&c have been due since a couple of months now for jee 2014 batch. Please take these classes as soon as possible. Thanks.
trigo ill-27
trigo ill – 72
what does “most general solution mean” ? ……and there are 2 solutions of both A and B which one should we chose as answers
?
trigo objective worksheet q 29,31,8,15
bhaiya,in trigo
in ill-61,how to combine the 2 general soln?
plz explain ill-62
objective worksheet-ques 15
objective worksheet-in ques 28,shouldn’t we do by identity method?
trigo-illus 38,43
bhaiya,what approach we must follow in these kind of quesns.
osw-15
trigo ined question 6…how to brak up sin c/2
2sinc/4cosc/4
awsome class sir
enjoyed it!
class was gud but around 50 to 60 percent questions were there in videos
straight lines objective worksheet 41-43
very good class sir. worth the time it consumed
bhaiya class was very good but there was a problem that when you move your cursor the screen on which you were teaching becomes magnified and i cant see clearly.
PLZ SUGGEST WHAT TO DO
sir the class was gr8
bt i felt like sleepy in the last 10 mins.
i knw you also have a tight schedule
bt could you atleast consider beginning such classes at half an hour earlier
Bhaiya, you said that we have spend more time on circles. But I have completed the circles’ module. Please tell what we’re supposed to do after completing module. Should I revise that again?
trigo
objective worksheet
question 15
38
39
43
44
53
64-66
plzzz someone give the group code for founder iit jee 2015…THANK YOU
Bhaiya the volume was very low.
If possible, pls maximize the volume.
Trigo:
Illus.- 76
Ine D: 6,7
Ine E: 8
OW: 9,15,35,38,39(B is also correct), 40,46,49,55( C is wrong), 56,60,61, Para: (63,64,65,66),70,72
Trigonometry ,
OWS Q-53
Q-63
hw test 1
quadratic test7- q 3,5,6,7
trigo test 2-q8
test3-q5 q6
test4-q1,2,8,10
test 5-q2,7,10
what is the period of asinx + bcosx
FUNCTIONS
sir please explain the preferential order of carrying out transformations….
because in questions like Q.20{O.W.S} it changes the entire scenario….
also the solution of ques.22 of the same doesn’t seem to be apt as in the solution the functional {} has been removed…
sir first one is clear but plz explain the 2nd one.,…………………….
can we apply LH rule and formula at the same time in a question…. i.e. take derivative first and then apply formula or vice versa
ill-22 pg-16 dc-1
SIR I AM FROM 2014 BATCH PLEASE TAKE DISCUSSION CLASS ON MOCK TEST1(ADV) ALSO SINCE MANY QUESTIONS WERE WRONGLY PRINTED, PLEASE DISCUSS THOSE .
IT ALSO HELPS TO MAINTAIN CONTINUITY IN MATHS IN THIS TIME.