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The Geometrical meaning of the second derivative is the curvature of the function. If the function has zero second derivative it is straight or flat.
If the second derivative of a function is zero, then the function has a constant slope, and that function is linear. Therefore, any point that belongs to that function lies on a line.
well, the second derivative is the derivative of the first derivative. so, the 2nd derivative of a function's indefinite integral is the derivative of the derivative of the function's indefinite integral. the derivative of a function's indefinite integral is the function, so the 2nd derivative of a function's indefinite integral is the derivative of the function.
No. If the range of the first function is not the domain of the second function then the composite function is not defined.
you use the output of the first function as the input of the second function.