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纵观近几年各省高考和市质检题,三角函数与其它知识交汇的好题不胜枚举,很多试题设计别致新颖.本文特精选举例予以分类解析,旨在探究几种题型规律,供读者参考.一、关注以零点为背景的三角综合题例1(2013年福建高考)已知函数f(x)=sin(ωx+φ)(ω>0,0<φ<π)的周期为π,图像的一个对称中心为(π/4,0),将函数f(x)图像上的所有点的横坐标伸长为原来的2倍(纵坐标不变),
Throughout the provinces in recent years, the provincial college entrance examination and the quality of examination questions, the intersection of trigonometry and other knowledge are numerous, and many of the questions designed novel and unique.This article is a selection of examples to be classified analysis, to explore several types of questions, For readers reference.First, pay attention to the background of the triangular synthesis of the first example (2013 Fujian college entrance examination) known function f (x) = sin (ωx + φ) (ω> 0,0 <φ <π) period Is π, a center of symmetry of the image is (π / 4,0), and the abscissa of all points on the image of function f (x) is doubled (the ordinate is constant)