Trigonometry Reference

Trigonometric and inverse trigonometric functions, identities, exact values and common angle tables, linked to the Calxy trigonometry calculator.

• Trigonometric FunctionsThe three basic trigonometric functions relate an angle to ratios of lengths. This page defines them, gives exact and decimal values for every multiple of 15° from 0° to 360°, and lists the identities used most often.
• Inverse Trig ValuesThe principal values of the inverse sine, cosine and tangent at the arguments that come up most often, given exactly (as fractions of π), in decimal radians and in degrees.
• Inverse Trig Functionsarcsin, arccos and arctan undo sine, cosine and tangent on restricted intervals. This sheet gives their domains and ranges, describes their graphs and collects their derivatives, integrals and compositions with the ordinary trig functions.