$\int_0^{\pi /2} {\frac{{dx}}{{2 + \cos x}}} = $

  • A
    $\frac{1}{{\sqrt 3 }}{\tan ^{ - 1}}\left( {\frac{1}{{\sqrt 3 }}} \right)$
  • B
    $\sqrt 3 {\tan ^{ - 1}}\left( {\sqrt 3 } \right)$
  • C
    $\frac{2}{{\sqrt 3 }}{\tan ^{ - 1}}\left( {\frac{1}{{\sqrt 3 }}} \right)$
  • D
    $2\sqrt 3 {\tan ^{ - 1}}\left( {\sqrt 3 } \right)$

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Difficult
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જો $I=\int_1^3 \sqrt{3+x+x^2} dx$ હોય,તો $I$ કયા અંતરાલમાં આવે છે?

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