sin^6 x+cos^6 x=1/4(sin^2 x)^3+(cos^2 x)^3=1/4(sin^2 x +cos^2 x)(sin^4 x -sin^2 x*cos^2 x+cos^4 x)=1/4(sin^2 x-cos^2 x)^2+sin^2 x*cos^2 x=1/4cos^2 2x +(sin^2 2x)/4=1/41/4+3/4*cos^2 2x=1/4所以 cos2x=0...
解方程:4(sin^6 x+cos^6 x)=1,x∈[0.pi/2]
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