求 sin 210° + tan(−135°) + tan 225° + cos(−840°) 之值為何?(A) −2 (B) −1 (C) 0 (D) 1 (E)2

問題詳情

2. 求 sin 210° + tan(−135°) + tan 225° + cos(−840°) 之值為何?
(A) −2
(B) −1
(C) 0
(D) 1
(E)2

參考答案

答案：[無官方正解]
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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