The cosine is ±1/sqrt(5) = ±0.4472 (approx).
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They are used to find the angle or side measurement of a right triangle. For example, if 2 sides of a right triangle have known values and an angle has a known measurement, you can find the third side by using sine, cosine or tangent.
Its Tangent, APEX "The tangent of an angle is the ratio of the opposite leg length to the adjacent leg length."
236-124/2=56 degrees
31 degrees
The definition, in terms of the sides of a right angled triangle, is very restrictive since it defines tangent only for angles in the interval (0, pi/2) radians = (0, 90) degrees. However, the function is actually defined for all numbers.So, the tangent of an angle is best defined by the ratio of the sine and cosine of the angle for any angle other than an odd multiple of pi/2.If the angle is x radians, thensin(x) = x - x^3/3! + x^5/5! - x^7/7! + ...cos(x) = 1 - x^2/2! + x^4/4! - x^6/6! + ...and thentan(x) = sin(x)/cos(x).