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If f(x)a n dg(x) are two differentiable ...

If `f(x)a n dg(x)` are two differentiable functions, show that `f(x)g(x)` is also differentiable such that `d/(dx)[f(x)g(x)]=f(x)d/(dx){g(x)}+g(x)d/(dx){f(x)}`

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