1.

Given that the derivative f'(a) exists. Indicate which of the following statements(s) is/are always true?

Answer»

`F'(a)=lim_(htoa)(f(H)-f(a))/(h-a)`
`f'(a)=lim_(hto0)(f(a)-f(a-h))/h`
`f'(a)=lim_(t to0)(f(a+2t)-f(a))/t`
`f'(a)=lim_(t to0)(f(a+2t)-t(a+t))/(2t)`

Answer :A::C::D


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