Consider the function z = ln(x^2 + y^2 ) + xy, and suppose that x = t^2 − s^2 and y = 2ts. A. First, find the partial derivatives ∂z/∂t and ∂z/∂s at the point where t = s = 1 using the chain rule. B. Next, determine an explicit formula for z in terms of t and s, and then use standard differentiation rules to compute the same partial derivatives, ∂z/∂t and ∂z/∂s , at the point where t = s = 1. C. Do your answers in parts A and B coincide?

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