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The pages on this site contain documentation for very old MS-DOS software,
purely for historical purposes.
If you're looking for up-to-date documentation, particularly for programming,
you should not rely on the information found here, as it will be woefully
out of date.
COS, SIN, and TAN Functions Details
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COS(angle)
SIN(angle)
TAN(angle)
Usage Notes
■ The cosine of an angle in a right triangle is the ratio between the
length of the side adjacent to the angle and the length of the
hypotenuse.
■ The sine of an angle in a right triangle is the ratio between the
length of the side opposite the angle and the length of the
hypotenuse.
■ The COS, SIN, and TAN functions are calculated in single precision if
numeric-expression or angle is an integer or single-precision value.
If you use any other numeric data type, they are calculated in double
precision.
■ TAN (tangent) is the inverse of ATN (arctangent).
■ The tangent of an angle (the value returned by TAN) in a right triangle
is the ratio between the length of the side opposite an angle and the
length of the side adjacent to it.
■ To convert values from degrees to radians, multiply the angle (in
degrees) by pi/180 (or .0174532925199433) where pi = 3.141593.
■ To convert a radian value to degrees, multiply radians by 180/pi (or
57.2957795130824).
■ Pi has the following approximate value:
pi = 3.14159265359 or pi = 4.0 * ATN(1.0)