Say I'm given a function the function u itself is not defined. when i take a partial derivative with respect to x, do i just write it as or is there a chain rule that i have to follow?
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Originally Posted by dlbsd Say I'm given a function the function u itself is not defined. when i take a partial derivative with respect to x, do i just write it as or is there a chain rule that i have to follow? indeed there is a chain rule. let and , then you want . by the chain rule,
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