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Evaluate: ∫-421x2+4x+13⋅dx - Mathematics and Statistics

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प्रश्न

Evaluate: `int_(-4)^2 (1)/(x^2 + 4x + 13)*dx`

योग
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उत्तर

`int_(-4)^2 (1)/(x^2 + 4x + 13)*dx`

= `int_(-4)^2 (1)/(x^2 + 4x + 4 + 9)*dx`

= `int_(-4)^2 (1)/((x + 2)^2 + 3^2)*dx`

= `[1/3tan^-1 ((x + 2)/3)]_(-4)^2`

= `(1)/(3)tan^-1 ((2 + 2)/3) - (1)/(3)tan^-1((-4 + 2)/3)`

= `(1)/(3)tan^-1 (4/3) - (1)/(3)tan^-1 (-2/3)`

= `(1)/(3)[tan^-1  4/3 + tan^-1  2/3]`      ...[∵ tan–1 (–x) = –tan–1 x]

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अध्याय 4: Definite Integration - Exercise 4.2 [पृष्ठ १७१]

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बालभारती Mathematics and Statistics 2 (Arts and Science) [English] Standard 12 Maharashtra State Board
अध्याय 4 Definite Integration
Exercise 4.2 | Q 1.1 | पृष्ठ १७१
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