NTA Abhyas JEE Main2020MathematicsIndefinite IntegrationPractice
If the integral Ι = ∫ e sin x cos x ⋅ x 2 + 2 x d x = e f x g x + C (where, C is the constant of integration), then the number of solution(s) of f x = g x is/are
Options
- A0
- B2
- C4
- D6
Correct answer
B. 2
Step-by-step solution
As, Ι = ∫ e f x f ′ x g x + g ′ x d x = e f x g x + C Thus, ∫ e sin x cos x ⋅ x 2 + 2 x d x = e sin x ⋅ x 2 + C i.e. f x = sin x & g x = x 2 Which intersect at ‘ 2 ’ points.