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函数的单调性是函数的重要性质,在解题时,常常出现错误,下面对各种错误进行剖析,并给出正确的解法．一、忽略函数的定义域 [例1]函数y=lg(x2-2x-3)的单调增区间为 ( )
The monotony of a function is an important property of the function. When solving a problem, errors often occur. The following sections analyze various errors and give the correct solution. I. Ignoring the domain of the function [Example 1] The monotonically increasing interval of the function y=lg(x2-2x-3) is ()