Mathematics
Senior High
Solved
シカク7の解き方が分からないので教えてください
(2) a=6, c=5, B=150°
「7] AABC において, a=7, b=8, c=9のとき, 次のものを求めよ。
(1) cos Aの値
(2) sin Aの値
(3) △ABCの面積S
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