The SEC function calculates the secant of an angle provided in radians. The secant is the reciprocal of the cosine of the angle.
=SEC(0)→1The secant of 0 radians is 1.
=SEC(PI()/3)→2The secant of PI/3 radians (60 degrees) is 2.
Select a cell
Click on the cell where you want to display the result.
Enter the formula
Type =SEC(number) and replace 'number' with your angle in radians.
Press Enter
Press Enter to calculate the secant value.
Use the RADIANS function, for example: =SEC(RADIANS(60)).