A.有界函數(shù) B.嚴(yán)格增函數(shù) C.周期函數(shù) D.偶函數(shù)
A.[0,π] B.[-π/2,π/2] C.[-1,1] D.全部實(shí)數(shù)
A.前者遞增后者遞減 B.兩者都遞減 C.前者遞減后者遞增 D.兩者都遞增