cos(-x-2π) 和cos(π-x) 化简
化简cos(π/2-x)cos(π/2+x)cot(π-x)/sin(3π/2+x)cos(3π+x)tan(π+x)
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2sinx*cosx*cos(2π-x)+cos(π+2x)*cosx*tanx
化简cos(2π/3-x)+cos(2π/3+x)+cosx
化简:1.【(sin^2)(-X-π) *cos(π+X)cosX】/【tan(2π+X) *(cos^3 (-X-π)
已知函数f(x)=cos(2x-π/3)+sin^2 x-cos^2 x
已知函数f(x)=cos(2x-π\3)+sin²x-cos²x
1.化简f(x)=cosx(asinx-cosx)+cos(π/2-x)cos(π/2-x).2.化简f(x)=4cos
f(x)=4cos(wx-π/6)sinwx-cos(2wx+π) 化简
cos(x-π/2)的奇偶性
cos[2(π-x)]=-cos2x对不对?
设函数f(x)=2cos^2(x+π/6)-cos^2x