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Evaluate: π∫0π4sec4x dx - Mathematics and Statistics

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प्रश्न

Evaluate: `int_0^(π/4) sec^4 x  dx`

योग
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उत्तर

Let I =  `int_0^(π/4) sec^4 x  dx`

= `int_0^(π/4)  sec^2 x . sec^2  x  dx`

= `int_0^(π/4)  (1 + tan^2x) sec^2 x  dx`

Put tan x = t

∴ sec2 x dx = dt

Also, if x = 0, then t = 0

And if x = `π/4`, then t = 1

∴ I = `int_0^1 (1 + t^2) dt`

= `int_0^1 dt + int_0^1 t^2 dt`

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

= `1 + 1/3`

= `4/3`

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Methods of Evaluation and Properties of Definite Integral
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
2021-2022 (March) Set 1

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