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If f(x)=|x-1|+|x-3|,then value of f'(2) ...

If `f(x)=|x-1|+|x-3|`,then value of `f'(2)` is equal to

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  3. If f(x)=|x-1|+|x-3|,then value of f'(2) is equal to

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  4. if y=(secx+tanx-1)/((-secx)+tanx+1), then find(dy)/(dx) at x=(pi)/(4).

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