Usst Puzzle !! ♡

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Across
  1. 1. A man who's name starts with an "Al"
  2. 5. the place where Dr. Ahmed was born in
  3. 6. the book which was made by Al Biruni
Down
  1. 2. the place where Ibn Sina was brought up
  2. 3. गणित in english?
  3. 4. the man who was tutored and brought up by an Indian teacher