Mathematics
Senior High
この問題の解き方が分かりません。
103. 次の式を簡単にせよ。
G) sin60"cos135"+cos60*sin135" (2) tan120*tan195*tan150*
(3) cos20"+sin40*-sim140"+cos160『 (4) sin9sin(180*-の)-cos9cos (180"-の
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