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'e' is the eccentricity of the hyperbola...

'e' is the eccentricity of the hyperbola `x^2/a^2 -y^2/b^2=1` and `theta` is the angle between its asymptotes . The value of `sin(theta/2)` is (A) `sqrt(e^2-1)/e` (B) `e/sqrt(e^2-1)` (C) `sqrt((e^2+1)/(e^2-1))` (D) `sqrt((e^2-1)/(e^2+1))`

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