設有向角θ的始邊為 x 軸正向，且 tan θ = ，若終邊上有一點及另一點 Q(a, b)，則下列哪些選項是正確的﹖(A) x = -10 (B) (C) (D) (5) a+ b

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2. 設有向角θ的始邊為 x 軸正向，且 tan θ = ，若終邊上有一點及另一點 Q(a, b)，則下列哪些選項是正確的﹖
(A) x = -10
(B)
(C)
(D) (5) a+ b 可能為-103

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