問題詳情
3.已知0°<θ<360°，若a=cosθ，b=cos(90°+θ)，c=cos(180°+θ)，d=cos(270°+θ)，試問下列哪些選項是正確的？
(A)a+b+c+d=0
(B)a+c=b+d
(C)abcd>0
(D)a2+b2=c2=d2
(E)若d最大，則b最小
(A)a+b+c+d=0
(B)a+c=b+d
(C)abcd>0
(D)a2+b2=c2=d2
(E)若d最大，則b最小
參考答案
答案：E
難度：適中0.5
統計：A(1),B(0),C(1),D(0),E(1)
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