Mathematics
Senior High
この2題の解き方を教えてください。
答えは
451(1)π/6≦θ＜π/2 ,
π/2＜θ≦ 5π/6
(2)15/16
452(1)-1/3
(2)AB=2√6/3 , AC=2√6/3
(3)1/3
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