Question

ПОМОГИТЕ УПРОСТИТЬ ВЫРАЖЕНИЕ!

Answer 1

3sina-4sin^a+sina/3sina-4sin^3a-sina=sina(3-4sin^2+1)/sina(3-4sin^2-1)=4-4sin^2a/2-4sin^2a=4(1-sin^2)/2(1-2sin^2a)=(1-sin^2)/1-2*(1-cos2a)/2=(1-sin^2)/cos2a