Find the derivative of `f(x)=x"\ "a t"\ "x=1`

Explanation

We have given the function `x` ,

Then `f(x)=x`

Now by derivative formula,

`f'(a)=lim(h->0)(f(a+h)-f(a))/h`

`f'(a)=lim(h->0)((a+h)-(a))/h`

At `x=pi/2`

`f'((pi)/2)=lim(h->0)((1+h)-1)/h`

`f'((pi)/2)=lim(h->0)(1+h-1)/h`

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