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Evaluate : ∫0π4sec4x⋅dx - Mathematics and Statistics

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प्रश्न

Evaluate : `int_0^(pi/4) sec^4x*dx`

बेरीज
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उत्तर

Let I = `int_0^(pi/4) sec^4x*dx`

= `int_0^(pi/4) sec^2x*sec^2x*dx`

= `int_0^(pi/4) (1 + tan^2x)sec^2x*dx`
Put tan x = t
∴ sec2x·dx = dt
When x = 0, t = tan 0 = 0

When x = `pi/(4), t = tan  pi/(4)` = 1

∴ I = `int_0^1 (1 + t^2)*dt`

= `[t + t^3/(3)]_0^1`

= `1+ (1)/(3) - 0`

= `(4)/(3)`.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 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
पाठ 4 Definite Integration
Exercise 4.2 | Q 2.1 | पृष्ठ १७२
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