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AP EAMCET202120 Aug 2021Morning ShiftMathematicsIndefinite IntegrationActual

If ∫ 0 a d x 4 + x 2 = π 8 , then the value of a =

Options

  1. A1
  2. B2
  3. C3
  4. D4

Correct answer

B. 2

Step-by-step solution

∫ 0 a d x 4 + x 2 = π 8 ∫ 0 a d x 2 2 + x 2 = π 8 Use, ∫ d x a 2 + x 2 = 1 a tan - 1 x a + c ⇒ 1 2 tan - 1 a 2 = π 8 ⇒ tan - 1 a 2 = π 4 ⇒ a 2 = tan π 4 ⇒ a 2 = 1 ⇒ a = 2

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