sin(π/3-x)=3/5,cos(5/6π-x)=-3/5

已知cos(π/2+x)=sin(x-π/2) 求sin^3(π-x)+cos(x+π)/5cos(5π/2-x)+3s cos(π/6-x)=根号3/3则cos(5π/6+x)-sin(x-π/6)的平方 化简sin(x)(cos(x)+cos(3x)+cos(5x)+cos(7x)) 已知sin (π/6-x) =3/5,则cos(x+π/3) 已知sin(π/3-X),则cos(5π/6-X)=? 化简sin(3π-x)cos(x-3/2)cos(4π-x)/tan(x-5π)cos(π/2+x)sin(x-5/2π 已知cos 2x=3/5,求sin^4 x+cos^4 x的值 sin(5x)-sin(3x)= 根号2cos(4x) 已知cos（π/4-x）=-3/5,求sin2x/sin（x+π/4） x∈[π/4,π/3],f(x)=1/2sin(x-5π/12)cos(5π/12-x)+[(根号3)/2][sin(x 已知cos（x+π/4）=3/5求sin2x-2sin^2x 已知函数f(x)=cos(2x-π/3)+sin^2 x-cos^2 x