sin(π/6+x)=1/3 cos(2π/3-2x)=?
已知f(x)=-1/2+sin(π/6-2x)+cos(2x-π/3)+cos平方x.
求证 tan(2π-X)sin(-2π-X)cos(6π-X)/ sin(X+3π/2)*cos(X+3π/2)=-ta
已知函数f(x)=cos(2x-π/3)+2sin(x-π/4)sin(x+π/4)=sin(2x-π/6) ,
化简2sin^2[(π/4)+x]+根号3(sin^x-cos^x)-1
化简(1)√3sin x+cos x (2)√2(sin x-cos x) (3)√2cos x-√6sin x
已知函数 y=sin(2x-(π/3))+cos(2x-(π/6))+2cos²x-1,x∈R
已知函数f(x)=cos(2x-π/3)+sin^2 x-cos^2 x
已知函数f(x)=cos(2x-π\3)+sin²x-cos²x
证明下列恒等式: (1)2sin(2/π+x)cos(2/π-x)*cosθ+(2cos^2x-1)*sinθ=sin(
已知函数f(x)=sin(2x+π/3)+sin(2x-π/3)+2cos²x-1,x∈R
已知函数f(x)=(√3/2)sinπx+(1/2)cosπx,x∈R
函数f(x)=根号3sinωx+cosωx(ω>0)怎样变为f(x)=2sin(ωx+π/6)