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## Main Question or Discussion Point

Hello everyone,i want to know about derivatives in detail!!suppose a function say a=x^2 has derivative 2x,i want to know what does that mean?how we'll prove it?if we put x=2,then a=4 and if we put x=3,we'll get a=9,does that mean a=9-4=5,the change?

Sorry for the long question..

Thanks!!

Sorry for the long question..

Thanks!!