just an angle, like any other angle.
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They are true statements about trigonometric ratios and their relationships irrespective of the value of the angle.
There are several topics under the broad category of trigonometry. * Angle measurements * Properties of angles and circles * Basic trigonometric functions and their reciprocals and co-functions * Graphs of trigonometric functions * Trigonometric identities * Angle addition and subtraction formulas for trigonometric functions * Double and half angle formulas for trigonometric functions * Law of sines and law of cosines * Polar and polar imaginary coordinates.
The trigonometric functions are sine, cosine and tangent along with their reciprocals and the inverses. Whether the angle is acute or obtuse (or reflex) makes no difference).
It is a trigonometric function which converts the angle into a ratio.If the angle A is measured in radians, thencos(A) = 1 - A^2/2! + A^4/4! - a^6/6! + ...
cos(22) is a trigonometric ratio and, if the angle is measured in degrees, its value is 0.9272