I am working on a problem that results in expressions with trig functions and their derivatives along with several other functions and derivatives. At one point, the subtraction of two expressions resulted in an expression proportional to 1 + sin”[x] / sin[x] whose value is obviously zero. How do I get Mathematica to evaluate the second derivative and thus reduce this expression to the value zero? This is just an example of a more general problem of long expressions in which I would like all the symbolic derivatives to be replaced by their values.
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