Mathematics
Senior High
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数2の三角関数の問題で(2)番の解き方が分かりません。教えて欲しいです🙇‍♀️🙏

□ 252 次の等式を証明せよ。 *(1) (1+sin+cos 0)²+(1+sin 0-cos 0)²=4(1+sin 0) cos²0-sin20 1-tan 0 (2) 1+2 sin cos 0 1+tan 0

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