Arcsec Calculator
Find inverse secant angle in degrees and radians
Calculate Clear
Arcsec Formula
arcsec(x) = arccos(1 / x)
Arcsec is the inverse of secant. Because secant is the reciprocal of cosine, arcsec is commonly evaluated by taking arccos of 1 divided by the input.
⚠ Input must be <= -1 or >= 1. Values between -1 and 1 are outside the real arcsec domain.
How Arcsec Works
If sec θ equals x, then cos θ equals 1/x. The calculator uses that relationship to return the principal angle.
Inverse Secant
Arcsec reverses secant.
Cosine Link
arcsec(x)=arccos(1/x).
Angle Units
Result is shown in degrees and radians.
💡 Example: arcsec(2)=arccos(0.5)=60°=1.047198 rad.
Applications of Arcsec
Reciprocal Functions Trig Equations Calculus Graphing
Frequently Asked Questions
What is an arcsec calculator?▼
It finds the angle whose secant equals the input value.
What is the arcsec input range?▼
The input must be less than or equal to -1, or greater than or equal to 1.
How is arcsec calculated?▼
A common method is arcsec(x)=arccos(1/x).
How do I use this calculator?▼
Enter a valid secant value and click Calculate.
Where is arcsec used?▼
Arcsec is used in reciprocal trig equations, calculus, graphing, and advanced trigonometry.
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