Trigonometric Function Calculator

sin, cos, tan, csc, sec, cot, asin, acos, atan, acsc, asec, acot, atan2

The input for arcsine and arccosine must be between -1 and 1. Inverse cosecant and inverse secant require |x| ≥ 1.

acot uses atan2(1, x), with a principal angle between 0 and π for finite x; atan2(y, x) uses the point’s quadrant and rejects (0, 0). tan, csc, sec and cot reject denominator magnitudes below 1e-14. Decimal places round the display, not the calculation’s error. Binary64 approximations can lose substantial angle information for very large inputs; a finite result does not establish accuracy for the original decimal angle.