Mathematics
Senior High
13-12cos(180-B)から13＋12cosBへの計算教えてください。
29
また,四角形 ABCD は円に内接するから
AACD に余弦定理を適用して
AC=2?+3?-2·2·3cosD=13-12cos(180°-B)
D=180°-B
パー=13+12 cos B
2②
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