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Grade: 11
        
I didn't understand the part where-
4sin^2 A= -[(x+1/x)^2 -4]  is equal to 4sin^2 A = i^2 [x-1/x)^2]      ( the second last step)
7 months ago

Answers : (1)

Aditya Gupta
1150 Points
							
We know that (x+1/x)^2-4= x^2+1/x^2-2= (x-1/x)^2
Also i^2=-1
So that's the way in which the last few manipulations were done.
7 months ago
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