(浙江版)2018年高考数学一轮复习第04章三角函数与解三角形测试题

?f?x??2sin???2x???6?? ?增区间： ??k??????6,k??3???k?Z? （2）f?B??2 ?sin??2B?????6???1?B?3 又b?3，由正弦定理得： a?2sinA,c?2sinC?2sin?????A?3???a?c2?2sinA?sin(A+?3）=3sin?????A?6?? A???0,2?????A????????36????6,2???sin???A??6???????12,1??? ?3sin?????3??A?6??????,3，即?a?c???2????3,3? ?2??2??? - 13 -