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Let z(x,y) =x^(3) - 3x^(2)y^(3), where x...

Let z(x,y) `=x^(3) - 3x^(2)y^(3)`, where `x = se^(t), y =se^(-t), s, t in R`. Find `(del z)/(del s)` and `(del z)/(del t)`

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