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Test whether the following functions are...

Test whether the following functions are increasing or decreasing :
`f(x)=cosx, 0 lt x lt pi`.

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To determine whether the function \( f(x) = \cos x \) is increasing or decreasing in the interval \( (0, \pi) \), we will follow these steps: ### Step 1: Find the derivative of the function The first step is to differentiate the function \( f(x) \). \[ f'(x) = \frac{d}{dx}(\cos x) = -\sin x \] ...
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