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Evaluate the following: ∫-π2π2log(2+sinx2-sinx)⋅dx - Mathematics and Statistics

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प्रश्न

Evaluate the following:

`int_((-pi)/2)^(pi/2) log((2 + sin x)/(2 - sin x)) * dx`

मूल्यांकन
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उत्तर

Let I = `int_((-pi)/2)^(pi/2) log((2 + sin x)/(2 - sin x)) * dx`

Let f(x) = `log((2 + sin x)/(2 - sin x))`

∴ f(– x)= `log[(2 + sin (-x))/(2 - sin (-x))]` 

= `log((2 - sin x)/(2 + sin x))`

= `-log((2 + sin x)/(2 + sin x))`

= – f(x)

∴ f is an odd function.

∴ `int_((-pi)/2)^(pi/2) f(x) * dx` = 0

∴ `int_((-pi)/2)^(pi/2)log((2 + sin x)/(2 - sin x)) * dx` = 0.

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अध्याय 4: Definite Integration - Exercise 4.2 [पृष्ठ १७२]

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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 3.07 | पृष्ठ १७२
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