I find directional derivatives confusing. For example if there is a change in a direction and if this direction have both x and y components should not the change be calculated as square root of squares, i.e the pythogores theorem? Would you please provide a simple demonstration showing the directional derivative in terms of partial derivatives with respect to both x and y.(adsbygoogle = window.adsbygoogle || []).push({});

Thank you.

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# I Directional Derivative demonstration

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