Famous Indian Mathematician

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Across
  1. 3. Discovered zero
  2. 4. Approximation of PI
  3. 5. Shakuntala Devi
  4. 7. Trignometry was discovered by him
Down
  1. 1. theory of numbers
  2. 2. Satyender Nath Bose
  3. 6. Mahavira