Question

sin^2 65 + sin^2 25 + cos^2 35 + cos^2 55 = ?

Answer 1

Use this:

1. \[\large{\sin(90 - \theta) = \cos{\theta}}\]

2. \[\large{\sin^2 x + \cos^2 x = 1}\]

Answer 2

got it.. thank u :)

Answer 3

Your welcome :)