1)1- sin2x=cosx-sinx(сosx-sinx)²-(cosx-sinx)=0(cosx-sinx)(cosx-sinx-1)=0cosx-sinx=0/cosx≠01-tgx=0⇒tgx=1⇒x=π/4+πncosx-sinx-1=0cos²x/2-sin²x/2-2sinx/2cosx/2-sin²x/2-cos²x/2=0-2sin²x/2-2sinx/2cosx/2=0-2sinx/2(sinx/2+cosx/2)=0sinx/2=0⇒x/2=πn⇒x=2πnsinx/2+cisx/2=0/cosx/2≠0tgx/2=-1⇒x/2=-π/4+πn⇒x=-π/2+2πn 2)2(cos x- sin x)²- 5 (sin x - sin x)+2=02(cosx-sinx)²=-2(cosx-sinx)²=-1нет решения