Question

Question #eb864

Answer 1

`cos^2 41 + cos^2 37 + cos^2 49 + cos^2 53`

`=cos^2 (90-49) + cos^2 (90-53) + cos^2 49 + cos^2 53`

`=sin^2 49 + sin^2 53 + cos^2 49 + cos^2 53`

`=(sin^2 49 + cos^2 49)+ (sin^2 53 + cos^2 53)`

`=1+1=2`