d/dX(Cos²x)

Question

Can I use coding to differentiate (find derivative) of this???

Answer 1

Yes

Answer 2

Dev 188 try the derivative formula with a small value for h.

(f(x+h) - f(x))/h

In digital floating point there is a minimal value that can be stored, so h cannot really be infinitessimally small.

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Of further interest, in a study of computer numerical methods it was found that you will get better accuracy if you use a balanced derivative formula, like this:

(f(x+h) - f(x-h))/(2*h)

It would be interesting to find out your results. Let us know!