# I'm a beginner in Calculus. I have 2 doubts.

### I'm a beginner in Calculus. I have 2 doubts.

Why cannot we take limit as Δy approaching 0 in the derivative formula?
Why do we not differentiate the coefficients with x? f.eg: y=3x^2=6x....shouldn't the constant=0??
Sorry if these are dumb.
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### Re: I'm a beginner in Calculus. I have 2 doubts.

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