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∫0113+2x-x2dx = ______

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Question

`int_0^1 1/(sqrt(3 + 2x - x^2))dx` = ______ 

Options

  • `pi/6`

  • `pi/3`

  • `pi/4`

  • `pi/2`

MCQ
Fill in the Blanks
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Solution

`int_0^1 1/(sqrt(3 + 2x - x^2))dx` = `underline(pi/6)`

Explanation:

`int_0^1 1/(sqrt(3 + 2x - x^2))dx`

= `int_0^1 1/(sqrt(4 - 1 + 2x - x^2))dx`

= `int_0^1 1/(sqrt((2)^2 - (x - 1)^2))dx = [sin^-1((x - 1)/2)]_0^1`

= `sin^-1(0) - sin^-1(-1/2) = 0 - (-pi/6)`

= `pi/6`

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