Just like the sine function displaced by pi/2. In other words the cosine equals 1 at 0 degrees, 0 at 90 degrees, -1 at 180 and so on.
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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.