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2. If:- f(r,u) 4(y-2r), what is the total derivative? If initially z 4 and y 3, and then a increases by one and y decreases by two small units, then what is the change in ? 13. If z f(z,y)-(2x + y1/2)2, what is the total derivative? If initially z # i/2 and y-1, and then r increases by four and z increases by two small units, then what is the change in y?

12. If z f(x, y) 4(ry 2), dz 4(y - 2)dz +4rdy. If initially z 4 and y 3, and dz 1 and -2, then 1- 4dx -32 or dz - 33/4 dy and y- 1, and then dz 4 and dz -2, then 2 32 + 2dy or dy-15. 13. I:f(r, y) (2r y/2), dz (2)2(2ry2)dz + (1/2y-1/2)2(2r+y2)dy. If initially z - 1/2

Please show step by step answers of how to solve BOTH these questions, so I can easily understand. the second image provides the answers, but I need to know how to get there. Thank you

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Saluution Now Tota/ derivative dz:는.dx+ dy That is h tal derivultve고 the sum of all the Artial derivatves mulhlbiad y change

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