Mathematics
Senior High
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教えてほしいです

半角の公式を使って Sinlso を求めよ

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✨ Best Answer ✨

sin^2(30°/2)=(1-cos30°)/2=(2-√3)/4より
sin15°=√(2-√3)/2(sin15°>0なので+の方)
二重根号とるなら
√(2-√3)=√{(4-2√3)/2}=(√3-1)/√2=(√6-√2)/2なので、sin15°=(√6-√2)/4となりますね。

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