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2.若90°<θ<180°,且sinθ+cosθ=1/5,則下列何者為真?(A)cosθ=-3/5(B) cos2θ=7/25(C)sin2θ=-24/25(D)sinθ/2=1/√5(E
問題詳情
2.若90°<θ<180°,且sinθ+cosθ=1/5,則下列何者為真?
(A)cosθ=-3/5
(B) cos2θ=7/25
(C)sin2θ=-24/25
(D)sinθ/2=1/√5
(E)tanθ/2=2
參考答案
答案:E
難度:適中0.5
統計:A(1),B(1),C(1),D(0),E(1)
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