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Evaluate : Nt ("X" + 1)/("X"("X" + Log"X")Dx - Mathematics and Statistics

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प्रश्न

Evaluate : `int ("x" + 1)/("x"("x" + log"x")`dx

योग

उत्तर

Let I = `int ("x" + 1)/("x"("x" + log"x")`dx

= `int (("x" + 1)/"x")/("x" + log"x")`dx

= `int (1 + 1/x)/(x + logx)` dx

= `int [(d/dx)(x + logx)]/(x + logx)` dx

= log |x + log x| + c

`(int f(x)/f(x) dx = log |f(x)| + c)`

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