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For each of the differential equations i...

For each of the differential equations in Exercises from 11 to 15, find the particular solution satisfying the given condition :
11.`( x + y) dy + ( x - y) dx = 0, y = 1` when x = 1

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The correct Answer is:
`log (x^(2) + y^(2)) + 2 tan^(-1) (y)/(x) = (pi)/(2) + log 2`
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