若sin(π/6-α)=1/3,求cos(2π/3-α)的值 急
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若sin(π/6-α)=1/3,求cos(2π/3-α)的值急若sin(π/6-α)=1/3,求cos(2π/3-α)的值急若sin(π/6-α)=1/3,求cos(2π/3-α)的值急因为sin(π
若sin(π/6-α)=1/3,求cos(2π/3-α)的值 急
若sin(π/6-α)=1/3,求cos(2π/3-α)的值 急
若sin(π/6-α)=1/3,求cos(2π/3-α)的值 急
因为sin(π/6-a)=1/3 so sin(-π/6+a)=-1/3.because -π/6+a-a+2π/3=π/2 so cos=sin=-1/3