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Find int (x + 1)/((x + 2)(x + 3)) dx. - Mathematics

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Question

Find `int (x + 1)/((x + 2)(x + 3)) dx`.

Sum
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Solution

`int (x + 1)/((x + 2)(x + 3)) dx = int (x + 2 - 1)/((x + 2)(x + 3)) dx`

⇒ `int (x + 1)/((x + 2)(x + 3)) dx = int 1/((x + 3)) dx - int {1/((x + 2)) - 1/((x + 3))} dx`

= log |x + 3| – log |x + 2| + log |x + 3| + C

⇒ `int (x + 1)/((x + 2)(x + 3)) dx = 2 log |x + 3| - log |x + 2| + "C"`

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2019-2020 (March) Delhi Set 3
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