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How would I do these problems using Implicit Differentiation? I don't understand how to do them. Help?

Find $dy/dx$ if $\cos(4x)-2xe^{4y}=0$.

AND

Find slope of the tangent line to the curve $\sqrt{12x+8y}+\sqrt{2xy}=12$ at the point $(4,2)$.

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    You received some nice answers to your last question. You should accept one.2012-10-01
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    for the second one, it is -1. Just calculate the derivative and plug in values.2013-05-11

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