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1.下列各等式何者恆為正確? (A)cos(x - y) = cos(y - x) (B)cos0 = 0 (C)sin2x = 2sinx (D)tan(x + y) = tanx + tany
問題詳情
1.下列各等式何者恆為正確?
(A)cos(x - y) = cos(y - x)
(B)cos0 = 0
(C)sin2x = 2sinx
(D)tan(x + y) = tanx + tany
參考答案
答案:A
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