надо упростить выражение : ( 1-tg^a)* (1-cos^2(п/2+а))*1/cos a- sin a
-(sin(пи/(a+2))^2*tg^a-sin(пи/(a+2))^2+cos(a)*sin(a))/cos(a)
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-(sin(пи/(a+2))^2*tg^a-sin(пи/(a+2))^2+cos(a)*sin(a))/cos(a)