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let z^2 = x^2 + y^2, encontre dz/dt em (x,y) = (1,3) sabendo que dx/dt = 4 and dy/dt = 3
let z^2 = x^2 + y^2, encontre dz/dt em (x,y) = (1,3) sabendo que dx/dt = 4 and dy/dt = 3
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