化简sin^4x+cos^4x-3/4

化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x 证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4 化简sin(3π-x)cos(x-3/2)cos(4π-x)/tan(x-5π)cos(π/2+x)sin(x-5/2π 化简2sin^2[(π/4)+x]+根号3（sin^x-cos^x）-1 (1-(sin^4x-sin^2xcos^2x+cos^4x)/sin^2x +3sin^2x 求4sin(3x)cos(x)的导数式 ∫ sin^4(x)cos^3(x)dx sin^3x/cos^4x 的积分 根号下(sin""x+4cos"x)-根号下(cos""x+4sin"x)=? 用cos x表示sin^4 x -sin^2 x +cos^2 x 已知f(x)=cos^4x-2根号3sinxcosx-sin^4x 化简 已知cos 2x=3/5,求sin^4 x+cos^4 x的值