The argument of the cosine function must be (2pi/3)*x radians
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One way is to shift it to the left by a quarter of the period.
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].
Tangent = sine/cosine provided that cosine is non-zero. When cosine is 0, then tangent is undefined.