Tg9π2-α∙sin15π-α-sin13π2-αsin217π2-α+sin2(12π-α)

Tg9π2-α=tg4π+π2-α=tgπ2-α=ctgα
sin15π-α=sin14π+π-α=sinπ-α=sinα
sin13π2-α=sin6π+π2-α=sinπ2-α=cosα
sin17π2-α=sin8π+π2-α=sinπ2-α=cosα
sin12π-α=sinα;
sin217π2-α+sin212π-α=cos2α+sin2α=1
tg9π2-α∙sin15π-α-sin13π2-αsin217π2-α+sin212π-α=ctgα∙sinα-cosα1=ctgα∙sinα-cosα=
=cosαsinα∙sinα-cosα=cosα-cosα=0
Ответ:0