怎样证明 sin X-cosX=√2(X-π/4)
利用cosx=sin(π/2-x),sin'x=cosx,证明(cosx)'=-sinx
怎样使f(x)=sinx+cosx=√2*sin(x+π/4)
sinx+cosx=√2sin(x+0.25π)的证明过程
sinx+cosx=√2sin(x+π/4)
证明x∈(0,π/2),cos(cosx)>sin(sinx)
证明成立:[cos(3x)-sin(3x)]/(cosx+sinx)=1-2sin(2x).
证明数列极限|cosx-cosx0|=|-2sin(x+x0)/2*sin(x-x0)/2|
已知函数f(x)=2cosx*sin(x+π/3)-√3sin^2x+sinx*cosx
证明:Sinx+(根号3)*Cosx=2Sin(x+π/3)
如何证明tan x/2 =sin/(1+cosx)=(1-cosx)/sinx
证明下列恒等式:(1)(cosx-1)²+sin²x=2-2cosx
证明cosx(cosx-cosy)+sinx(sinx-siny)=2sin(x-y)/2