化简cos(x+3o.)CoSx+Sin(x+30.)Sinx
化简cos(x+3o.)CoSx+Sin(x+30.)Sinx
sinx+cosx/sinx-cosx=2 求sinx/cos^3x +cosx/sin^3x
化简sin(x+y)sinx+cos(x+y)cosx等于?
化简sin(x+y)sinx+cos(x+y)cosx
化简cos(x+y)sinx-sin(x+y)cosx
化简sin^4x/sinx-cosx - (sinx+cosx)cos^2x/tan^2x-1
:用泰勒展开式将cos(sinx)、cos(cosx)、sin(cosx)、sin(sinx)展开到x^3项怎么做?
f(x)=2cos*sin(x+π/3)-^3sin^2x+sinx*cosx
证明成立:[cos(3x)-sin(3x)]/(cosx+sinx)=1-2sin(2x).
sinx-2cosx=o,sin²x-sinxcosx-2cos²+2
已知(2sinx+cosx)(sinx+2cosx-3)=0 求sin 2x+cos 2x/tan 2x
sinx*sin(x+y)+cosx*cos(x+y)等于?