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1. Use partial differentiation to determine expressions for in the following cases: (i) x + y-2x2y=0 (ii) ex cos y = ey sin x

1. Use partial differentiation to determine expressions for in the following cases: (i) x + y-2x2y=0 (ii) ex cos y = ey sin x (iii) sinx-5 sin x cos y + tan y = 0

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