Question

3(sin^2 38 degree +sin^2 52 degree)

Answer 1

3[sin^2 38 degree +cos^2(90-38)]
3(sin^2 38 degree+ cos^2 38degree)

we know that
sin^2 theta + cos^2 theta= 1
so, 3× 1= 3.

I hope it will help you.