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Smooth function has derivatives of all orders. Polynomials have derivatives of all orders, thus polynomials are smooth functions.

For example: f(x)=2x+3 => f'(x)=2 => f''(x)=0 => f'''(x)=0...

So all derivatives exist. (Derivative being zero is ok.)

Their continuity can be proven using the Weierstrass (epsilon-delta) definition.

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These graphs contains only rounded curves with no point corners. It keeps going with no breaks in your drawing.

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Marva Brown

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4y ago
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Q: Why are graphs of polynomials smooth and continuous?
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