sin(π-x)sin(π/2 -x)+(cosx)²化简
已知函数f(x)=2cosx*sin(x+π/3)-√3sin^2x+sinx*cosx
设f(x)=2cosx.sin(x+π/3)-根号3 sin平方x+sinx.cosx
2sin(x-π/4)sin(x+π/4)=(sinx-cosx)(sinx+cosx)=-cos2a
化简f(x)=4sinx*sin^2((π+2x)/4)+(cosx+sinx)(cosx-sinx)
已知函数f(x)=2sinxcos(π2-x)-3sin(π+x)cosx+sin(π2+x)cosx.
化简:1.【(sin^2)(-X-π) *cos(π+X)cosX】/【tan(2π+X) *(cos^3 (-X-π)
已知sinx+cosx/2sinx-3cosx=3 求 2sin²x-3sin(3π+x)cos(π-x)-3
利用cosx=sin(π/2-x),sin'x=cosx,证明(cosx)'=-sinx
化简(根号3)/2sinx+1/2cosx=sin(x+π/6),
∫ (x+cosx)/(1+sin²x) dx
化简sin(2π+x)cos(π-x)sin(π-x)/cos(x-π)sin(-π-x)sin(π+x)
求2(cosπ/3sinx+sinπ/3cosx) =2 sin(x+π/3) 中2 sin(x+π/3)的得来?