SEC
Sec is the short version of the trigonometry SECANT() function.
This short version is always used in equations and expressions since it takes less space.
Used in an equation it might look like
sec x = 0.22
This would be interpreted as "The secant of x is 0.22". Most mathematicians would speak it as
"secant x equals 0.22". (It is rarely pronounced 'sec'.)
Definition of secant function in trigonometry as applied to right triangles
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