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Evaluate: ∫38(1-x)2x2+(11-x)2 dx

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प्रश्न

Evaluate: `int_3^8 (11 - x)^2/(x^2 + (11 - x)^2)  "d"x`

योग
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उत्तर

Let I = `int_3^8 (11 - x)^2/(x^2 + (11 - x)^2)  "d"x`   .......(i)

= `int_3^8 ([11 - (1 - x)]^2)/((11 - x)^2 + [11 - (11 - x)]2)  "d"x`      ........`[∵ int_"a"^"b" "f"(x)"d"x = int_"a"^"b" "f"("a" + "b" - x)"d"x]`

∴ I = `int_3^8 x^2/((11 - x)^2 + x^2)  "d"x` .......(ii)

Adding (i) and (ii), we get

2I = `int_3^8 (11 - x)^2/(x^2 + (11 - x)^2)  "d"x + int_3^8 x^2/((11 - x)^2 + x^2)  "d"x`

= `int_3^8  ((11 - x)^2 + x^2)/(x^2 + (11 - x)^2)  "d"x`

∴ 2I = `int_3^8 1. "d"x`

∴ I= `1/2[x]_3^8`

∴ I = `1/2(8 -3)`

∴ I =`5/2`

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Methods of Evaluation and Properties of Definite Integral
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अध्याय 2.4: Definite Integration - Short Answers II

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