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cos31°=m、sin31°=1−cos231°=1−m2、sin239°=sin(270°-31°)=-cos31°、tan149°=tan(180°-31°)=-tan31°、sin239°tan149°=(-cos31°)•(-tan31°)=cos31°tan31°=sin31°=1−m2の結果:1−m2
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