7.244
=(1/2) ∫ (sin4x+sin2x)dx=(1/2) ∫ sin4xdx+(1/2) ∫ sin2xdx=
=(1/2)*(1/4)(-cos4x)+(1/2)*(1/2)(-cos2x)+C=
=(-1/8)cos4x-(1/4)cos2x+ C
7.246
=(1/2) ∫ (cos3x-cos7x)dx=(1/2) ∫ cos3xdx-(1/2) ∫ cos7xdx=
=(1/2)*(1/3)(sin3x)-(1/2)*(1/7)(sin7x)+C=
=(1/6)sin3x-(1/14)sin7x+ C
Остальные, аналогично