I need to learn how to find normal unit vectors to surfaces. Is there a trick or a formula that I can use?(adsbygoogle = window.adsbygoogle || []).push({});

F. ex. the normal unit vector to the surface x^2+y^2+z^2=4 is 0,5(x,y,z), but why?

What can I do to find normal vectors in other cases?

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# Homework Help: Normal vectors

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