The arccosine is the angle whose cosine is the argument. The Acos function returns the arccosine, or inverse cosine, of its argument.
The Tan function returns the tangent of its argument, an angle specified in radians. The Sin function returns the sine of its argument, an angle specified in radians.
The Cot function returns the cotangent of its argument, an angle specified in radians. The Cos function returns the cosine of its argument, an angle specified in radians.
