Question

упростить 1) tg^2a-sin^2a= 2) 1-tg^2a+tg^4a/cos^2a=

Answer 1

sin^2a/cos^2a-sin^2a=sim^2a(1-cos^2a)/cos^2a=sin^2a*sin^2a/cos^2a=tg^2a*sin^2a

1-tg^2a+tg^4a/cos^2a=1-sin^2a/cos^2a+tg^4a/cos^2a=(cos2a+tg^4a)/cos^2a