Trigonometric functions
The trigonometric functions SIN, COS and TAN return the value corresponding to their argument in radians. SIN and COS are well-defined, continuous and differentiable for all values of their arguments; care must be exercised when using TAN because it is discontinuous.
The inverse trigonometric functions ARCSIN and ARCCOS are undefined for arguments outside the range -1 to +1 and special care is required to ensure that no attempt is made to evaluate them outside this range. Derivatives for the inverse trigonometric functions are always calculated numerically.
© 2001-2025 Fair Isaac Corporation. All rights reserved. This documentation is the property of Fair Isaac Corporation (“FICO”). Receipt or possession of this documentation does not convey rights to disclose, reproduce, make derivative works, use, or allow others to use it except solely for internal evaluation purposes to determine whether to purchase a license to the software described in this documentation, or as otherwise set forth in a written software license agreement between you and FICO (or a FICO affiliate). Use of this documentation and the software described in it must conform strictly to the foregoing permitted uses, and no other use is permitted.