1、1/75,2/75,3/75,4/75,5/75,1,,,1,1,,,1,R,奇函数,偶函数,6/75,7/75,(,k,,,0),x,k,8/75,9/75,10/75,11/75,12/75,13/75,14/75,15/75,16/75,17/75,18/75,19/75,20/75,21/75,22/75,23/75,24/75,25/75,26/75,27/75,28/75,29/75,30/75,31/75,32/75,33/75,34/75,35/75,36/75,37/75,38/75,39/75,40/75,41/75,42/75,43/75,44/75,45/75,46/7
2、5,47/75,48/75,49/75,50/75,51/75,52/75,53/75,方法技巧,易错点睛,1.讨论三角函数性质,应先把函数式化成yAsin(x)(0)形式.,2.对于函数性质(定义域、值域、单调性、对称性、最值等)能够经过换元方法令tx,将其转化为研究ysint性质.,1.闭区间上最值或值域问题,首先要在定义域基础上分析单调性;含参数最值问题,要讨论参数对最值影响.,2.要注意求函数yAsin(x)单调区间时A和符号,尽可能化成0时情况,防止出现增减区间混同.,3.计算形如ysin(x),xa,b形式函数最值时,不要将x范围和x范围混同.,54/75,55/75,56/75,57/75,58/75,59/75,60/75,61/75,62/75,63/75,64/75,65/75,66/75,67/75,68/75,69/75,70/75,71/75,72/75,73/75,74/75,75/75,