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Integrate the function 11+4x2

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प्रश्न

Integrate the function `1/sqrt(1+4x^2)`

योग
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उत्तर

Let `I = int 1/sqrt(1 + 4x^2)  dx`

`= 1/2 int dx/sqrt(1/4 + x)`

`= 1/2 int dx/sqrt((1/2)^2 + x^2)`

`= 1/2 log abs (x sqrt(1/4 +x^2)) C_1`

       .....`[because int dx/sqrt(x^2 + a^2) = log abs (x + sqrt(x^2 + a^2)) + C]`

`= 1/2 log abs ((2x + sqrt(1 + 4x^2))/2) + C_1`

`= 1/2 log abs (2x + sqrt(1 + 4x^2)) - 1/2 log 2 + C_1`

`= 1/2 log |2x + sqrt 1 + 4x^2| + C`       .... [`C = -1/2 log 2 + C_1`]

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अध्याय 7: Integrals - Exercise 7.4 [पृष्ठ ३१५]

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एनसीईआरटी Mathematics Part 1 and 2 [English] Class 12
अध्याय 7 Integrals
Exercise 7.4 | Q 2 | पृष्ठ ३१५

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