✨ Best Answer ✨
半角の公式からsin^2(a/2)=(1-cosa)/2
両辺2をかけて1-cosa=1+1/√2
よってcosa=-1/√2
a=3/4π+2kπ、5/4π+2kπ
ただしkは整数⭕️
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✨ Best Answer ✨
半角の公式からsin^2(a/2)=(1-cosa)/2
両辺2をかけて1-cosa=1+1/√2
よってcosa=-1/√2
a=3/4π+2kπ、5/4π+2kπ
ただしkは整数⭕️
Users viewing this question
are also looking at these questions 😉
ありがとうございます！