高中數(shù)學(xué)三角函數(shù)專題訓(xùn)練

1、1高一年級(jí)數(shù)學(xué)——三角函數(shù)一、知識(shí)點(diǎn)歸納一、知識(shí)點(diǎn)歸納1、正弦函數(shù)、余弦函數(shù)和正切函數(shù)的圖象與性質(zhì)：sinyx?cosyx?tanyx?圖象定義域RR2xxkk????????????值域??11???11?R最值當(dāng)時(shí)，22xk??????k??；max1y?當(dāng)22xk????時(shí)，??k??min1y??當(dāng)時(shí)，??2xkk????；max1y?當(dāng)2xk????時(shí)，??k??min1y??既無(wú)最大值也無(wú)最小值周期性2?2??奇偶性奇函數(shù)偶

2、函數(shù)奇函數(shù)單調(diào)性在2222kk????????????上是增函數(shù)；在??k??32222kk????????????上是減函數(shù)??k??在上????22kkk??????是增函數(shù)；在??22kk????上是減函數(shù)??k??在22kk????????????上是增函數(shù)??k??函數(shù)性質(zhì)3（3）合理轉(zhuǎn)化：選擇恰當(dāng)?shù)墓?，促使差異的轉(zhuǎn)化。2、典型例題典型例題一、選擇題1若cos22π2sin4???????????，則cossin???的值為

3、（）Ａ72?Ｂ12?Ｃ12Ｄ722.0203sin702cos10??=（）A.12B.22C.2D.323.函數(shù)2sin(2)cos[2()]yxx?????是（）A周期為4?的奇函數(shù)B周期為4?的偶函數(shù)C周期為2?的奇函數(shù)D周期為2?的偶函數(shù)4求值000cos20cos351sin20??（）A1B2C2D35已知(0)2x???，4cos5x?，則?x2tan（）A247B247?C724D724?6函數(shù)3sin4cos5yxx?