複選題
62. 下列公式何者正確?
(A)1tan2x=sec2x
(B)cos2x=1+2sinx
(C)sin2x+cos2x=1
(D)sin2x=2sinxcosx

答案:登入後查看
統計: A(3), B(2), C(4), D(2), E(0) #2609400