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Let A = ⎭ ⎬ ⎫ ⎩ ⎨ ⎧ θ θ + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ π π ∈ θ imaginary purely is sin i 2 – 1 sin i 2 3 : , 2 – . Then the sum of the elements in A is :

1. 6 5 π
2. 4 3 π
3. 3 2 π
4. π

Correct answer: 3 2 π

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