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Grade: 11
        
 41,37,29
So please give me this question solution
Please explain the answer  step by step
4 months ago

Answers : (3)

Saurabh Koranglekar
askIITians Faculty
3177 Points
							576-2107_15654118649281738631499.jpg
						
4 months ago
Aditya Gupta
1717 Points
							
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 :)
4 months ago
Vikas TU
9484 Points
							
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 
4 months ago
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