Ответ:
Объяснение:cos2α/ (1-((cos²α)³+(sin²α)³)= cos2α/(1-((cos²α+sin²α)(cos⁴α-cos²α·sin²α+sin⁴α))=
cos2α/(1-( (cos²α+sin²α)²-3cos²α·sin²α))=cos2α/(1-1+3cos²α·sin²α)=
4cos2α/(3·(2cosα·sinα)²)=4cos2α/3sin²2α=4/3·ctg2α/sin2α.
15-5х+14х-21
15-5*(-0,6)+14*(-0,6)-21=15+3-8,4-21=-11,4