Question

СРОЧНО!!!!!!!!!!!!!!!
упростите cos^6x+sin^6x-sin^2x*cos^2x

Answer 1

(1-cos^2x)*cos^2x+cos^6x+sin^6x=cos^2x-2cos^2x+cos^6x+(sin^2x)^3=cos^6x+(1-cos^2x)^3-cos^2x=cos^6x+1-3cos^2x+3cos^4x-cos^6x-cos^2x=3cos^4x-2cos^2x+1=cos^2x(3cos^2x-2)+1