The differentiation of `cosx` with respect to x is -sinx i.e. `d/(dx)(cosx)=-sinx`

Explanation

To differentiate \( \cos x \) with respect to \( x \), we will use the definition of the derivative. The derivative of a function \( f(x) \) at a point \( x \) is defined as:

\[ f'(x) = \lim_{h \to 0} \frac{f(x + h) - f(x)}{h} \]

In our case, the function \( f(x) = \cos x \). Therefore, we need to find:

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