3/(cos^2 35° +cos^2 125°)

Question

3/(cos^2 35° +cos^2 125°)

Answer 1

Решение:
3/(cos^2 35° +cos^2 125°)= 3/(cos^2 35° +cos^2 ( 90° + 35°) = 3/(cos^2 35° + sin^2 35°)= 3/1 = 3
Ответ: 3.