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What is  equal to?

  1. 2ab
  2. 2πab 

Answer (Detailed Solution Below)

Option 3 :
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Detailed Solution

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Concept:

 

Calculation:

Let, I = 

Let tan x = t

⇒ sec2 x dx = dt

When x = 0, t = tan (0) = 0

When x = π/2, t = ∞ 

 

Hence, option (3) is correct. 

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