三角函数中的参数求值或求范围问题实际上是一般函数中此类问题的具体化,仍然包括等式恒成立、不等式恒成立以及函数最值三大类型,下面举例加以单述.1等式恒成立型这一类型包括奇偶性概念、周期性概念、存在性问题三种,解决方法有一般定义法或先用特值求解再进行证明两个思路. The problem of parameter evaluation or range finding in trigonometric functions is in fact a concretization of such problems in general functions. It still includes the equality of equality, the inequality of constancy, and the maximum value of the function. The following examples are given. This type of constant type includes the three concepts of parity, periodicity, and existential problems. There are two ways to solve the problem: the general definition method or the special value solution.