If u = x / (x + y), find du/dx, du/dy. If st, find as/at, s/du....
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If u = x² / (x² + y²), find du/dx, du/dy. If st", find as/at, əs/du. If z = ln √/u²2 + v² + w², find dz/du, dz/dv, dz/dw. For w = x³y³-2xy +6, find 0²w/dx² and a²w/dy² at the points where dw/dx = dw/dy = 0. For w = 8x² + y²¹ - 2xy², find a²w/ax² and 2² w/y² at the points where dw/dx=dw/dy = 0. For u = e cos y, (a) verify that 8²u/ərəy = d² u/əyəx; (b) verify that ²u/dx² +d²u/dy² = 0. If u = x² / (x² + y²), find du/dx, du/dy. If st", find as/at, əs/du. If z = ln √/u²2 + v² + w², find dz/du, dz/dv, dz/dw. For w = x³y³-2xy +6, find 0²w/dx² and a²w/dy² at the points where dw/dx = dw/dy = 0. For w = 8x² + y²¹ - 2xy², find a²w/ax² and 2² w/y² at the points where dw/dx=dw/dy = 0. For u = e cos y, (a) verify that 8²u/ərəy = d² u/əyəx; (b) verify that ²u/dx² +d²u/dy² = 0.
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