化简y=sin^4x-cos^4x,
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化简y=sin^4x-cos^4x,
y=sin^4x-cos^4x
=(sin²x+cos²x)(sin²x-cos²x)
=sin²x-cos²x
=-cos(2x)
=(sin²x+cos²x)(sin²x-cos²x)
=sin²x-cos²x
=-cos(2x)
化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)
MATLAB画图,y=sin(x)*(cos(x)-1)/((2*sin(x.^2)+4*cos(x)).^0.5)-(
y=sin^2x-3sinxcosx+4cos^2x是否等于y=sin^2x+cos^2x+3cos^2x-3/2*si
化简sin(x+y)cos(x-y)+cos(x+y)sin(x-y)
函数Y=cos^4 x - 2sin xcosx - sin^4 x 的最小正周期
y=sin^2x+sinxcoswx+cos^2x 化简
化简y=(cos x)^2+sin x -2 谢谢
已知函数y=4 cos²x+4倍根号3 sin x cos x-2,x∈R.
求函数y=sin^4x+cos^4x,x(0,π/6)的最小值
根号下(sin""x+4cos"x)-根号下(cos""x+4sin"x)=?
证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4
y=sin(-3x) =-sin3x y=cos(3x+π\4) =cos(π/2+3x-π/4) =-sin(3x-π