cos(π/4+x)=3/5,则sin(π/4-x)=?
已知sin(π/2-x)+sin(π-x)/cos(-x)+sin(2π-x)=2009,则tan(x+5π/4)等于?
证明sin^2(x)+cos^2(x+30)+sin(x)cos(x+30)=3/4
若sin(π/2+x)=-4/5,x属于(π/2,π),则cos(π/3-x)=
已知函数f(x)=cos(2x-π/3)+2sin(x-π/4)sin(x+π/4)
f(x)=cos(2x-π/3)+2sin(x-π/4)sin(x+/4π) 三角函数
已知函数f(x)=sin^2*x-根号3*sinπ/4*x*cosπ/4*x
化简sin(3π-x)cos(x-3/2)cos(4π-x)/tan(x-5π)cos(π/2+x)sin(x-5/2π
求化简f(x)=sin^2x+2根号3sin(x+π/4)cos(x-π/4)-cos^2x-根号3
f(x)=sin平方x+2根号3sin(x+π/4)cos(x-π/4)-cos平方x-根号3
已知sin(x-3π/4)cos(x-π/4)=-1/4,则cosx等于
已知cos(π/4-x)=-3/5,求sin2x/sin(x+π/4)
已知cos 2x=3/5,求sin^4 x+cos^4 x的值