Question

ДАЮ 35 СРОЧНО! ПОЖАЛУЙСТА!

Answer 1

5
(2sin²a+1-2sin²a)/1=1/1=1
6
1/(2cos²a-2cos²a+1)=1/1=1
7
1;(sina/cosa+cosa/sina)-1/2*sinacosa=1:(sin²a+cos²a)/(sinacosa)-sinacosa=
=sinacosa-sinacosa=0
8
(sina/cosa-cosa/sina)*tg2a=(sin²a-cos²a)/(sinacosa)*tg2a=
=-2cos2a/sin2a*tg2a=-ctg2a*tg2a=-1