已知sin(π6-α)=14,则sin(π6+2α)= ___ .
已知sin(π-α)=-2sin(π2+α),则sinα•cosα= ___ .
已知sin(3π−α)=−2sin(π2+α),则sinαcosα=( )
已知(3sinα+cosα)/(3cosα-sinα)=2,则2-3sin(α-3π)sin(1.5π-α)-[cos(
已知sin(π-α)=-2sin(π/2+α)则cos²α+sin2α
已知sinαcosα=18,则cosα-sinα的值等于 ___ .
已知sin(α+β)sin(β-α)=m,则(cosα)^2-(cosβ)^2=___
若cos2αsin(α-π4)=-22,则sinα+cosα的值为 ___ .
已知2sin(a/2)=cos(a/2),则sin(a+π/6)=
1.已知cos(π/6-α)=1/3,求sin(2/3π-α) 2.求证tan^2α-sin^2α=tan^2α-sin
已知6sin^2α+sinαcosα-cos^2α=0,求sin(2α+π/3)的值
已知α∈(0,π|2),2tanα+3sinβ=7,且tanα-6sinβ=1,求sinα的值
已知sinα是方程5x²-7x-6=0的根,求[sin(-α+3π/2)sin(π-α)tan²(2