Puzzle-o-Maths

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Across
  1. 1. Integrate Cos(x)
  2. 4. value that can vary
  3. 5. Smallest Marsenne Prime
  4. 6. a product
  5. 7. Calculated value of Pi first
  6. 9. study of relation between angles and triangle sides
  7. 11. Boundary is also called
  8. 12. Rectangle in 3D
Down
  1. 1. F(x)=x^3/3,F'(4)
  2. 2. 3 term polynomial
  3. 3. Numbers/variables
  4. 6. Cone when cut parallel to base we have : a cone and ______
  5. 8. Mathematics branch
  6. 10. Currency of Bangladesh