Question

函數(shù)y=1+cosx的圖象（　　）

• A、關(guān)于x軸對(duì)稱(chēng)
• B、關(guān)于y軸對(duì)稱(chēng)
• C、關(guān)于原點(diǎn)對(duì)稱(chēng)
• D、關(guān)于直線x=

  π

  2

  對(duì)稱(chēng)

Answer 1

分析：根據(jù)余弦函數(shù)y=cosx是偶函數(shù)關(guān)于y軸對(duì)稱(chēng)可得答案．

解答：解：∵余弦函數(shù)y=cosx是偶函數(shù)
∴函數(shù)y=1+cos是偶函數(shù)，故關(guān)于y軸對(duì)稱(chēng)，
故選B．

點(diǎn)評(píng)：本題主要考查余弦函數(shù)的圖象和性質(zhì)．對(duì)正余弦函數(shù)的圖象和性質(zhì)一定要熟練掌握，這樣才能做到游刃有余．