okay i was reading the book "div, grad cur and all that"(adsbygoogle = window.adsbygoogle || []).push({});

i've just started for my exam. but i got stuck in the beginning. i'm attaching the page cuz i really dont get it .

basically pages 14 and 15. i dont get how they calculate the components of u and v.

if someone explains u i'll get v obviously.

thanks

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# Vector calculus finding the surface normal

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