三角函数练习题(第一章)

一、选择题（每题4分，计48分）

2.如果 EMBED Equation.DSMT4 ，那么 EMBED Equation.DSMT4 =（ ） EMBED

Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED

Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED

Equation.DSMT4 EMBED Equation.DSMT4

3.函数 EMBED Equation.DSMT4 的最小正周期是 （ ） EMBED Equation.DSMT4

EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4

EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4

4.轴截面是等边三角形的圆锥的侧面展开图的中心角是 （ ）

EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED

Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4

EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4

5.已知 EMBED Equation.DSMT4 ，则 EMBED Equation.DSMT4 的值等于 （ ）

EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4

EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4

EMBED Equation.DSMT4 EMBED Equation.DSMT4

6.若 EMBED Equation.DSMT4 ，则 EMBED Equation.DSMT4 的值为 （ ）

EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4

7.下列四个函数中，既是 EMBED Equation.DSMT4 上的增函数，又是以 EMBED Equation.DSMT4 为周期的偶函数的是（ ）

EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4

EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4

EMBED Equation.DSMT4 EMBED Equation.DSMT4

，则 （ ）

8.已知 EMBED Equation.DSMT4 ， EMBED Equation.DSMT4 ， EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4 EMBED Equation.DSMT4