What is the relationship between derivative function and monotonicity of function? What is the relationship between derivative function and monotonicity of function? How to draw function image by derivative function, or draw derivative function by function? Please give specific examples. Is there a better way to remember them?

What is the relationship between derivative function and monotonicity of function? What is the relationship between derivative function and monotonicity of function? How to draw function image by derivative function, or draw derivative function by function? Please give specific examples. Is there a better way to remember them?

If the derivative function is greater than 0, then the function monotonically increases, less than 0, decreases, and equals 0, then the image is a straight line parallel to the X axis. The image of the derivative function corresponds to the tangent point of the corresponding function
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