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MHT CET2016MathematicsIndefinite Integration

∫ x 2 + 2 a x + tan - 1 ⁡ x x 2 + 1 d x = ________

Options

  1. Alog ⁡ a ⋅ a x + tan - 1 ⁡ x + c
  2. Bx + tan - 1 ⁡ x log ⁡ a + c
  3. Ca x + tan - 1 ⁡ x log ⁡ a + c
  4. Dlog ⁡ a ⋅ x + tan - 1 ⁡ x + c

Correct answer

C. a x + tan - 1 ⁡ x log ⁡ a + c

Step-by-step solution

I = ∫ ( x 2 + 2 ) a ( x + tan − 1 x ) x 2 + 1 d x = ∫ ( 1 + 1 x 2 + 1 ) e ( x + tan − 1 x ) ⋅ l n a d x Let ( x + tan − 1 x ) l n a = t ⇒ ( 1 + 1 1 + x 2 ) d x = d t l n a ⇒ I = ∫ e t l t l n a = e t l n a + C = a x + tan − 1 x l n a + C

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