Use the Chain Rule to calculate d/dt (r(t)) at the value of t given. (x,y)=lnx+lny, _r(t) =
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Use the Chain Rule to calculate d/dt ƒ(r(t)) at the value of t given.
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(x,y)=lnx+lny, _r(t) = (cost, t), t = 4/
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