JEE Advanced2006MathematicsIndefinite IntegrationActual
The value of (x^2-1 ) d x x^3 2 x^4-2 x^2+1 is
Options
- A2 2- 2 x^2 + 1 x^4 +C
- B2 2+ 2 x^2 + 1 x^4 +C
- C1 2 2- 2 x^2 + 1 x^4 +C
- DNone of these
Correct answer
C. 1 2 2- 2 x^2 + 1 x^4 +C
Step-by-step solution
Let I= (x^2-1 ) d x x^3 2 x^4-2 x^2+1 , On dividing numerater and denominator by x^5 , we get = ( 1 x^3 - 1 x^5 ) d x 2- 2 x^2 + 1 x^4 put 2- 2 x^2 + 1 x^4 =t ( 4 x^3 - 4 x^5 ) d x=d t I= 1 4 d t t = 1 4 t^ 1 / 2 1 / 2 = 1 2 t +c= 1 2 2- 2 x^2 + 1 x^4 +C