Mathematics
Senior High
矢印書いてあるところの計算がわかりません。なんで分母が1-sin^2θになるんですか？
sin (90°-0)
1+cos (90°+0)
cos (180°-0)
1+cos (90°-0)
cos O
1-sine
cos 0
1 + sin 0
2 cos 0
1-sin20
2 cos 0
cos² 0
2
cos 0
70
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