Question

下列函數(shù)中，既是偶函數(shù)又在上單調(diào)遞增的是（    ）

A．

B．

C．

D．

Answer 1

C

解析試題分析：函數(shù)是奇函數(shù)；函數(shù)在上不是單調(diào)函數(shù)；函數(shù)在上是單調(diào)遞減函數(shù)；當(dāng)時，是單調(diào)遞增函數(shù).
考點：冪函數(shù)、對數(shù)函數(shù)、余弦函數(shù)的奇偶性與單調(diào)性