sinφ=sin(8/3π+φ)时φ=?

sinφ=sin(8/3π+φ)时φ=? sin(2*3π/8+φ)=o怎么解 为什么2cosθ/2sinθ/2+2sinφ/2cosφ/2=sinα+sinβ 求证 sinθ-sinφ=2cos[(θ+φ)/2]sin[(θ-φ)/2] sinθ-sinφ=2cosθ+φ/2sinθ-φ/2 sin π/8 sin 3π/8= 化简sin(α+β)+sin(α-β)+2sinαsin(3π/2-β)= 已知1+sin^2φ=3sinφcosφ,求tanφ(急求!) Q=3*U*I*sinφ分别是什么意思?sinφ具体代表什么? 3sinθ+根号3cosθ=2根号3sin(θ+φ),(0 y=∫[H-R(sin(θ+φ)-sin(θ))]sin(θ)dθ怎么解啊 1-2sin²π/8=sinπ/4 2sin(α+π/3）=sinα+______ 2sin π/6 =sin π/3,吗,求解释,还有-sin π/6=sin- π/6吗 已知sin(3π-α)=-2sin(π/2+α)则sinαcosα 设函数f(x)=sin(2x+φ)(-π 设函数f(x)=sin(2x+φ)(-π 设函数f x=SIN(2X+φ)(-π