化简:cos^4(X)-sin^4(X)

化简sin^4x-sin^2x+cos^2x 化简:sin^4 x-sin^2 x+cos^2 x 化简cos^4x+sin^4x 化简:cos^4(X)-sin^4(X) 化简sin^4x+cos^2x 化简(sin^2x-cos^4x+cos^2x-sin^4x)/(sin^2x-cos^6x+cos^2x-sin^6x) 化简 1-sin^4x-cos^4x/1-sin^6x-cos^6x 化简(1-cos^4x-sin^4x)/(1-cos^6x-sin^6x) 化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x 化简[1-(sin^4 x-sin^2 xcos^2 x+cos^4 x)]/(sin^2 x)+3sin^2 x 化简【完整步骤!】1.（sin^4x-sin^2x）/secx2.sin^4x-cos^4x【这道题的正确答案是sin^2x-cos^2x】 cos x/sin x+sin x/(1+cos x) 化简. 化简sin^4x+cos^4x-3/4 化简:sin^4 x+cos^4 x-3/4 化简y=sin^4x-cos^4x, 化简sin(x-π/4)+cos(x+π/4) 化简cos^4x-2sinxcosx-sin^4x cos(x+π/4)+sin(x+π/4)化简