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[College Calculus] Why are second derivatives written like this?
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ghjm is
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College Calculus
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I've figured out from context that when my textbook says d2y/dx2, it means the second derivative - f''(x). I don't understand why the 2 is applied to the d in the numerator but the x in the denominator. It seems to me that the second derivative is d(dy/dx)/dx. Naively simplifying this, you get d2y/d2x2. Clearly, there's something going on with the d, but I don't quite understand what.
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