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AP EAMCET20225 Jul 2022Evening ShiftMathematicsDefinite IntegrationActual

_ - ^ 2 x(1+ x) 1+ ^2 x d x=

Options

  1. A2
  2. B^2
  3. C+2
  4. D/ 2

Correct answer

B. ^2

Step-by-step solution

Let I= _ - ^ [ 2 x(1+ x) (1+ ^2 x ) ] d x= _ - ^ [ 2 x (1+ ^2 x ) ] d x+ _ - ^ [ 2 x( x) (1+ ^2 x ) ] d xI=I₁+I₂ Take I₁= _ - ^ [ 2 x (1+ ^2 x ) ] d x aligned & f(x)= [ 2 x 1+ ^2 x ] & f(-x)= [ 2(-x) 1+ ^2( - x ) ] aligned aligned & =- [ 2 ( ^x ) 1+(- x)^2 ] & =- [ 2 ( ^x ) 1+ ^2 x ] aligned =-f ( ^x ) I₁= _ - ^ 2 x 1+ ^2 x d x=0 ( since f(x) is an odd function) Again consider aligned & g ( X )= 2 x x 1+ ^2 x & g (- x )= 2(- x ) (- x ) 1+ ^2(- x ) aligned = 2( x ) ( x ) 1+ ^2( x ) [ since (-x)=- x, (-x)= x]= g ( ^

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