Question

Упростить
(2cos²α-1)/(1-2sin²α)-sin²α

Answer 1

Решение/////////////

Answer 2

огромное спасибо

Answer 3

(2cos²α-1)/(1-2sin²α)-sin²α = (2cos²α - cos²α - sin²α) / (cos²α+sin²α-2sin²α) - sin²α = (cos²α-sin²α) / (cos²α-sin²α) - sin²α = 1 - sin²α = cos²α+sin²α-sin²α = cos²α