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Find the following derivatives. 2 Z and z . where z = 0xy - 5x y, x = 3s + 3t, and y =3s -3t [Type an expression using * and y as the variables.) E (Type an expression using s and t as the variables.) E (Type an expression using * and y as the variables.) dy (Type an expression using s and t as the variables.) E (Type an expression using s and t as the variables.) dy dt (Type an expression using s and t as the variables.) E (Type an expression using s and t as the variables.) = Z (Type an expression using s and t as the variables.)axv Use the alternative curvature formula K = to find the curvature of the following parameterized curve. 1v/ r(t) = (6 cost,