Mathematics
Senior High
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四角で囲まれている部分の計算の仕方を教えて下さい💦

1 1-12 cos2a=2cos² a-1=2. 1+t2 1+12

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✨ Best Answer ✨

2(1/(1+t^2))-(1+t^2)/(1+t^2)=(2-(1+t^2))/(1+t^2)=(2-1-t^2)/(1+t^2)=(1-t^2)/(1+t^2) です。 1+t^2 で通分しましょう

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