Question

當(dāng)時(shí)，函數(shù)取得最小值，則函數(shù) 

A．是奇函數(shù)且圖像關(guān)于點(diǎn)對(duì)稱

B．是偶函數(shù)且圖像關(guān)于點(diǎn)對(duì)稱

C．是奇函數(shù)且圖像關(guān)于直線對(duì)稱

D．是偶函數(shù)且圖像關(guān)于直線對(duì)稱

Answer 1

C

解析試題分析：因?yàn)楫?dāng)時(shí)，函數(shù)取得最小值，所以所以.
考點(diǎn)：本小題主要考查三角函數(shù)的圖象和性質(zhì).
點(diǎn)評(píng)：解決此類問(wèn)題，要借助三角函數(shù)的圖象，數(shù)形結(jié)合解決問(wèn)題.