Question

упростить выражение :(1-sin x)*(1+sin x)cos x; 6-6cos^2x2sin ^2x; 6 sin x*cos x2 cos^2 x-1; 4 sin x*cos x1-2 sin ^2 x ;

Answer 1

(1-sin x)*(1+sin x)/cos x=(1-sin^2 x)/cos x=(cos^2 x)/cos x
6cos^2 x/2sin^2 x=3tg^2 x
6sin x*cos x/2cos^2 x-1=3ctg-1