The cosine function is mathematical equation to determine the adjacent angle of a triangle. The cosine of an angle is the ratio of the length of the hypotenuse: so called because it is the sine of the co-angle.
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The differential of the sine function is the cosine function while the differential of the cosine function is the negative of the sine function.
Inverse of Cosine is 'ArcCos' or Cos^(-1) The reciprocal of Cosine is !/ Cosine = Secant.
I was not aware that the cosine function was in fashion!The range, on the other hand, is [-1, 1].
The argument of the cosine function must be (2pi/3)*x radians
Tangent = sine/cosine provided that cosine is non-zero. When cosine is 0, then tangent is undefined.