sin^2 a - sin^2 a cos^2 asin^2 a(1 - cos^2 a)sin^2 a sin^2 a(sin a sin a) (sin a sin a)sin^2 a sin^2 a(sin^2 a)^2
Ответ: (sin^2 a)^2
sin^2 a - sin^2 a cos^2 a
sin^2 a(1 - cos^2 a)
sin^2 a sin^2 a
(sin a sin a) (sin a sin a)
sin^2 a sin^2 a
(sin^2 a)^2
Ответ: (sin^2 a)^2