Question

1-(1-sinα)·(1+sinα)            упростить
________________
       tgα·cosα

Answer 1

1-1+sin^2α/sinα/cosα *cosα=sin^2α/sinα=sinα

Answer 2

1- (1-sin²α)= sin²α
tgα·cosα=(sinα·cosα)/cosα=sinα
sin²α:sinα=sinα