Brahmagupta's Contributions to Trigonometry

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Brahmagupta's formula for calculating the sine of an angle is given by:

  1. $\sin A = \frac{\sin \frac{A}{2}}{\cos \frac{A}{2}}$
  2. $\sin A = \frac{\sin A}{\cos A}$
  3. $\sin A = \frac{\tan A}{\sec A}$
  4. $\sin A = \frac{\cos A}{\sec A}$
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