Find f12(x, y) and f21(X, y) if f(x, y) = In (sin (xy)). O A. f12(x, y) = 1 - sin (xy) ; f21(x, y) = 1 + – Xy sin?(xy) O B. f12(x, y) = cot²(xy) - XV ; f21 (x, y) = cot2(xy) ху sin?(xy) sin(xy) cos(xy) - sin?(xy) sin(xy) cos(xy) – sin?(xy) sin(xy) cos(xy) sin (xy) sin?(xy) O . f12(x, y) = - XV ; f21(x, y) = sin(xy) cos(xy) – xy sin?(xy) sin(xy) cos(xy) – xy sin (xy) O D. f12(x, y) = - XV f21(x, y) = - O E. f12(x, y) = sin(xy) cos(xy) + xy sin?(xy) + XV ; f21(X, y) =

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