sin(a-π/6)=1/3,cos2a=?(a为锐角)
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sin(a-π/6)=1/3,cos2a=?(a为锐角)
sin(a-π/6)=1/3,cos2a=?(a为锐角)
sin(a-π/6)=1/3,cos2a=?(a为锐角)
sin(a-π/6)=1/3,cos2a=?(a为锐角)
sin(a-π/6)=1/3,cos2a=?(a为锐角)
sin(a-π/6)=1/3,cos2a=?(a为锐角)