PARTIAL DERIVATIVES 1.128. If f(x, y) = sin (y/x), find (a) f(2, 7/2), (b) f(2, r/2), (c) fy(2, T/2), (d) fr(2, T/2), (e) fry (2, 7/2), (f) fyz (2, T/2), (g) fyy (2, 7/2).

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