-2cos(a)^2+sin(a)^2
Пошаговое объяснение:
cos(3П/2+а)=sin(a)
cos2a=(cos(a)^2-sin(a)^2)
sin(a)^2-1-cos(a)^2+sin(a)^2
-(1-sin(a)^2)-cos(a)^2+sin(a)^2=
-cos(a)^2-cos(a)^2+sin(a)^2=-2cos(a)^2+sin(a)^2
-sin^2(a)
Пошаговое объяснение:
cos(2a)=1-2sin^2(a)
cos(3П/2+a)=sin(a)
sin(a)*cos(3П/2+a)-1-cos(2a)=
=sin(a)*sin(a)-1+1-2sin^2(a)=
=sin^2(a)-2sin^2(a)=-sin^2(a)
