If you are talking about an angle, it is the number that when added together will make the number 90 degrees or 180 degrees or 360 degrees.
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Complements are defined for angles, not trigonometric ratios of angles.
A 60 degree angle
In math best
Math is related to math because math(1) is technically math(2) itself, because there is really no description how math(1) is the same as math(2). There is only one math, except for types of math, like algebra.
Math is not just math you have to study it like subtration and addition. You use it on sheets or paper work.