Answer and explanation

Correct answer: D.

  1. Step 1: Use .
  2. Step 2: .
  3. Step 3: From 0 to : .
Answer
1 - pi/4.
Why not the others: is negative, but gives a positive area; adds instead of subtracts; mis-evaluates .

Practise more Calculus: Anti-differentiation and Areas Under Curves.

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