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普遍的な式は、tan X=Yを、sin(2X)=2Y/(1+Y^2)(sinx-2cosx)/(sinx+3cosx)=2対共にcosx(tanx-2)/(tanx+3)=2tanx-2=2(tanx+3)tanx=-8sinx*cosx=(1/2)*sin(2x)=(1/2)*2...
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