sin(x+y)cosx+cos(x+y)sinx=1/3 x∈(3π/2,2π) 求cos(2x+π/4)
求函数y=2sinx*cos(3π/2+x)+√3cosx*sin(π+x)+sin(π/2+x)*cosx的最小正周期
已知sinx+cosx/sinx-cosx=2,求2cos(π-x)-3sin(π+x)/4cos(-x)+sin(2π
sinx+cosx/sinx-cosx=2 求sinx/cos^3x +cosx/sin^3x
f(x)=2cos*sin(x+π/3)-^3sin^2x+sinx*cosx
y=sin^2x+2sinx*cosx+3cos^2x
y=sin²X+2sinX*cosX+3COS²X的最大值是?
sin^3x-cos^3x≥cosx-sinx,求x的取值范围.x∈{0,2π}
1.求函数y=log1/2cos(x/3+π/4)的单调区间 2.求函数y=sin²x+cosx-4(x∈R)
Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y)
y=cosX-根号3sinX,怎么化简道y=2cos(X+π/3)
证明x∈(0,π/2),cos(cosx)>sin(sinx)
已知sin(kπ+x)=-2cos(kπ+x)求(4sinx-2cosx)÷(5cosx+3sinx),和4sin&su