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Question 66
Let z=ln(x2+y2) z = \ln \left( \sqrt { x ^ { 2 } + y ^ { 2 } } \right) z=ln(x2+y2) . Then the differential dzd ^ { z }dz is
A) xdx+ydyx2+y2\frac { x d x + y d y } { x ^ { 2 } + y ^ { 2 } }x2+y2xdx+ydy B) xdx−ydyx2+y2\frac { x d x - y d y } { x ^ { 2 } + y ^ { 2 } }x2+y2xdx−ydy C) −xdx+ydyx2+y2- \frac { x d x + y d y } { x ^ { 2 } + y ^ { 2 } }−x2+y2xdx+ydy D) −xdx−ydyx2+y2- \frac { x d x - y d y } { x ^ { 2 } + y ^ { 2 } }−x2+y2xdx−ydy E) ydy+xdxx2+y2\frac { y d y + x d x } { x ^ { 2 } + y ^ { 2 } }x2+y2ydy+xdx
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