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Multiple choice

If the tangents from (3,4) to the circle ${x^2} + {y^2} - 3x - 4y + 1 = 0$ are making an angle $\theta$ with each other, then, $sin\theta = ?$

  1. $\frac{{\sqrt {21} }}{{24}}$
  2. $\frac{{2\sqrt[{}]{{21}}}}{{25}}$
  3. $\frac{{4\sqrt[{}]{{21}}}}{{25}}$
  4. $\frac{{\sqrt {21} }}{{25}}$
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