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How to find the monotone interval and definition domain of derivatives (college entrance examination derivatives)
Find the derivative function to see if it is beyond the equation. If not, let the derivative equation get zero. The range of derivative equations greater than zero is increasing. If it is less than zero, it will decrease. If the equation is transcendental, the second derivative is generally used, and the second derivative is always positive or negative in the college entrance examination.

If it is impossible to find two clues and three lines, you must use other methods.