sin(-23π/3)=
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sin(-23π/3)=
2sin(α+π/3)=sinα+______
已知sinα=-0.4,求下列三角函数值 sin(-α) sin(3π-α) sin(α-π) sin(α-10π)
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[sin(a-6π)cos(7π/2-a)]/[sin(3π+a)+sin(a-π)】=
若tanx=2,则2sin平方x-3sin(π-x)sin(π/2-x)=
sin(3∏-α)=-2sin(Π∕2+α)则sinαcosα等于
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傅里叶级数作图f(x)=2sin[x] - sin[2x] + 2/3sin[3x] - 1/2sin[4x]我用mathematica输入程序Plot[{2sin[x],-2sin[x],2sin[x] - sin[2x],-2sin[x] + sin[2x],2sin[x] - sin[2x] + 2/3sin[3x],-2sin[x] + sin[2x] - 2/3sin[3x],2sin[x] - sin[2x] + 2/3si
诱导公式的推导,如何利用公式sin(π+α)=-sinα 和sin(-α)=-sinα 得到sin(π-α)=sinα ?
①利用公式sin(π-θ)=sinθ和sin(∏+θ)=-sinθ证明:sin(-θ)=-sinθ②证明tanθsinθ∕tanθ-sinθ=1+cosθ∕sinθ③已知sinα-2cosα+1=0,α≠kπ+π∕2,k∈z求:tan(3π-α)和1∕sin2α-sinαcosα+1的值
3 在三角形ABC中,已知(a2+b2)sin(A-B)=(a2-b2)sin(A+B) 求证:ABC是等腰或直角三角形(a^2+b^2)sin(A-B)=(a^2-b^2)sin(A+B),(sin^A+sin^B)sin(A-B)=(sin^A-sin^B)sin(A+B) sin^A*(sin(A+B)-sin(A-B))=sin^B*(sin(A-B)+sin(A+B)) sin^A*2c
已知sin(π/6+a)=(根号3)/3,求sin(2π/3+a)?
1.已知2sin(3π+θ)=cos(π+θ),求2sin