Related Clues:
- 0, for 0 degrees
- It's 1 for a 90-degree angle
- It's .5 for a 30-degree angle
- It's 1, for a 90-degree angle
- Wave to a math teacher?
- Mathematics ratio
- ___ qua non (essential element)
- Trigonometrical function whose abbreviation is a type of lettuce
- Function associated with oscillation
- ... without science, regularly
- Function of heads of state in Near East
- Opposite-to-hypotenuse ratio
- Basic trig ratio
- It's 1 for a right angle
- Angle ratio