Question

Упростите выражение:
sin^2*x+Cos^4*x-0.75.

Answer 1

(1-cosx)/2+(1+cosx)²/4-3/4=(2-2cos2x+1+2cos2x+cos²2x-3)/4=1/4*cos²2x

Answer 2

$1/2-1/2cos2x+ \frac{1+2cos2x+ cos^{2}x }{4} -3/4= -1/4-1/2cos2x+1/4+1/2cos2x+1/4 cos^{2}2x=1/4 cos^{2}2x = sin ^{2}x+ ( \frac{1+cos 2x}{2})^{2}-0.75= \frac{1-cos 2x}{2}+ \frac{ (1+cos 2x)^{2} }{4} -0.75= =$