If xs2 + yt2 = 1 and x2s + y2t = xy − 4, find ∂x/∂s, ∂x/∂t, ∂y/∂s, ∂y/∂t, at (x, y, s, t) = (1, −3, 2, −1). Hint: To simplify the work, substitute the numerical values just after you have taken differentials.

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