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41,37,29 So please give me this question solution Please explain the answer step by step

 41,37,29
So please give me this question solution
Please explain the answer  step by step

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Grade:11

3 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
4 years ago
576-2107_15654118649281738631499.jpg
Aditya Gupta
2081 Points
4 years ago
Q37
we know that cos2y= 2cos^2y – 1
put y = 2x
cos4x=  2[cos(2x)]^2 – 1= 2[2cos^2x – 1]^2 – 1. now let cosx=C
so cos4x= 2(4C^4+1 – 4C^2) – 1= 8C^4 – 8C^2+1
kindly approve :)
Vikas TU
14149 Points
4 years ago
Hiii vedant 
Please ask question in sequence , do not ask 2-3 question in same set , as image become blurt. and it is not clearly visible many times. 
Good luck 
Cheers 

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