设α为锐角,若cos(α+π/6)=4/5,则sin(2α+π/3)的值为?
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设α为锐角 若cos (α+π/3)=1/5则cos(α-π/6)=
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设a为锐角,若cos(a+π/6)=4/5,则sin(2a+π/12)的值为多少?