Inverse Cosine Calculator
Use the calculator for the inverse cosine to learn the definition of this function, its graph, and much more!
arcsin30°0.5235987756 radians
In radians0.5235987756
arcsin30°
arccos60°
arctan26.565051°
Check0.5the function applied back to the answer
The formula
arcsin, arccos and arctan undo the trig functions
Principal values
Each trig function repeats, so its inverse would have infinitely many answers. The convention is to return one principal value:
arcsinandarctan— from −90° to 90°arccos— from 0° to 180°
So arcsin(0.5) gives 30°, even though 150° also has a sine of 0.5. When solving an equation you usually need both.