Question

Упростите выражения
Sin^2(3П/2+a)/ctg(a-2П) +sin^2 (-a) /ctg^2 (a-3П/2)

Answer 1

(sin^2((3П/2)-а))/(ctg(a-2П))+(sin^2(-a))/(ctg^2(a-(3П/2)))=cos^2a/ctga+sin^2a/tg^2a=sina*cosa+sina*cosa=2sina*cosa