e Day Crossword Puzzle (2.7)

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Across
  1. 2. Abbreviation for sine
  2. 3. Abbreviation for cotangent
  3. 4. The sum or total of a set/sequence of numbers
  4. 6. Abbreviation for cosine
  5. 8. Variables or unknown in an equation (3 letters)
  6. 9. The function f as applied to the variable or argument x (written as one word)
  7. 10. The symbol used to represent the sum or total of a set/sequence of numbers
  8. 13. Country where the mathematician is from
  9. 15. Constants, such as the sides of a triangle (3 letters)
Down
  1. 1. Where the mathematician got his education
  2. 3. Abbreviation for cosecant
  3. 5. The “Imaginary unit” equal to the square root of -1
  4. 7. The creator of e
  5. 10. Abbreviation for secant
  6. 11. The ratio of a circle’s circumference to its diameter
  7. 12. Abbreviation for tangent
  8. 14. The base of the natural logarithm, a constant equal to 2.71828