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Evaluate: ∫12x1+x2 dx

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Question

Evaluate: `int_1^2 x/(1 + x^2)  "d"x`

Sum
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Solution

`int_1^2 x/(1 + x^2)  "d"x = 1/2 int_1^2 (2x)/(1 +  x^2)  "d"x`

= `1/2[log|1 + x^2|]_1^2`    ........`[∵ int ("f'"(x))/("f"(x))  "d"x = log|"f"(x)| + c"]`

= `1/2(log 5 - log 2)`

=`1/2 log(5/2)`

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Methods of Evaluation and Properties of Definite Integral
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Chapter 2.4: Definite Integration - Very Short Answers

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