Question

Ребят, спасите :((((

Answer 1

ctg (π/2 + 5α) · ctg (π – 5α) + (1 – cos²α) / (1 – sin²α) =
= – tg 5α · (– ctg 5α) + sin²α / cos²α =
= 1 + tg²α = 1 / cos²α