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Given, $i=\sqrt{-1}$, the value of the definite integral, $I= \int_0^{\pi/2} \dfrac{\cos x+ i \sin x}{\cos x – i \sin x} dx$ is:

  1. $1$
  2. $-1$
  3. $i$
  4. $-i$
in Calculus retagged by
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