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Grade: 11
        
How tonsolve this?
__________________________-____________________
3 months ago

Answers : (7)

Aditya Gupta
825 Points
							
let theta=t and cost=y
then y=plus minus 1/2root2
when y is positive, t can have 2 values in 0 to 2pi, one is in 0 to pi/2 (call it t1) and other is in 3pi/2 to 2pi (call it t4)
when y is negative, t can have 2 values in 0 to 2pi, one is in pi/2 to pi (call it t2) and other is in pi to 3pi/2 (call it t3).
so the values satisfying in 0 to 4pi in ascending order are:
t1, t2, t3, t4, t1+2pi, t2+2pi, t3+2pi, t4+2pi
note that t3=t1+pi because cost3= – cost1= cos(t1+pi). similarly for t4=t2+pi
so 2 APs can be formed as follows:
t1, t3, t1+2pi, t3+2pi
and t2, t4, t2+2pi, t4+2pi
so the common difference has to be pi.
 
3 months ago
ABC
12 Points
							
But the answer given here is
Four AP are formed................................................
Whom should I consider true?
Book or you? 
3 months ago
Aditya Gupta
825 Points
							Hhhnhhhhhb
						
3 months ago
Aditya Gupta
825 Points
							
Well, sometimes askiitians can get as frustrating as can get. The website design has so many bugs! I just wrote a long answer but due to technical error it didn't show up. :( Only had they put some more effort.
I am 100% correct and the answer the answer in your book is wrong. 
There is a channel on YouTube called DOUBTNUT and it has the exact same problem that you have asked above. And his answer and explanation matches with what I have written. So my advice to you would be to go get some good and standard books rather than picking up books off the streets and then getting caught in confusion.
3 months ago
ABC
12 Points
							
Ohh ,please think before wrirtng anything sir,
This problem is from India's most trusted institute
Allen material, I don't think so it is wrong.
I haven't picked it from street.
Very bad experience today.......😢😢
3 months ago
ABC
12 Points
							
Ok I will consider you right................. ..................
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3 months ago
Aditya Gupta
825 Points
							
Ok so first thing sorry if I sounded rude to you. 
Next thing I have myself studied from Allen institute and I was in the top batch. Aman Bansal and me were in the same batch xd. 
Now lemme comment on Allen's material. Idk if it has changed now, but in my time Allen modules sucked for the most part, and the wuesquest were easy enough to be skipped. The only thing practice worthy was exercise 4B. 
If you are looking to practice some real good material, I would suggest fiitjee and resonance modules. I only had just one practice module of math from resonance and it was perfection. Also, fiitjee modules are top class.
Btw, all the best for your preparations!
3 months ago
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Course Features

  • 31 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


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