Прошу помощи: Задание№1. Упростите выражения:
a) 1-cos²α=
б) sin²α-1=
в) cos²a+(1-sin²α)=
г) sin²α+2cos²α-1=
д) (1-sin α)(1+sin α)=
e) (cos α -1)(1+cos α)=
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