In a triangle, we use terms like adjacent and opposite. These refer to sides in relation to angles. In our musical triangle, the drummer is at one angle in the back. This side, where the audience is, is called the opposite side.
Trunc is database function, try using round for numeric values, or change the Processing of Query to database.
Turorial to explore and understand the period of each of the 6 trigonometric functions: sin (x), cos (x), tan(x), cot (x), sec (x) and csc (x). Before you start the tutorial, you might want to work through a tutorial on periodic functions . We use the definition of a periodic function. f(x) = f(x + P) , where P is a real number.