已知Y= -2cos(x+π)×sin(π\ 2 -x) -cos(π -x)+sin(π -x)sinx
已知函数f(x)=2cos(X)sin(X+π/3)-(根号3)(SINX)平方+sinXcosX
已知sinx+cosx/2sinx-3cosx=3 求 2sin²x-3sin(3π+x)cos(π-x)-3
已知f(x) =sin^2 x +2sinx cos x + 3 cos^2 x ,x∈(0 ,π) .
已知f(x)=-1/2+sin(π/6-2x)+cos(2x-π/3)+cos平方x.
已知函数f(x)=sin(2x+π/6)+sin(2x+π/6)+2cos²x
设0≤x≤π/2,求cos(sinx)>sin(cos)
证明COS(X+Y)COS(X-Y)=COS^2X-SIN^2Y
化简sin(2π+x)cos(π-x)sin(π-x)/cos(x-π)sin(-π-x)sin(π+x)
高一数学:已知函数f(x)=2cos*sin(x+π/3)-√3sin^2x+sinx*cosx
求证:sin(x-y)/(sinx-siny)=cos[(x-y)/2]/cos[(x+y)/2]
1.y=cos^4x+sin^4x 求周期 2.y=(sin2x+sin(2x+π/3))/( cos2x+cos(2x
已知f(x)=sinx+2sin(π/4+x/2)cos(π/4+x/2).