Question

10cos^2x-5+10sin^2x
помогите

Answer 1

1=sin^2x+cos^2x
10cos^2x-5(sin^2x+cos^2x)+10sin^2x=10cos^2x-5sin^2x-5cos^2x+10sin^2x=5cos^2x+5sin^2x

Answer 2

Решение:
$10cos^2x-5+10sin^2x = 10*(cos^2x + sin^2x) - 5 = 10*1 - 5 = 5$
Ответ: 5.