"Robin" wrote:
I am trying to find cotangent in the formulas. there is sin and cosine I
thought about trying to divided sin/cosine but it will not allow it.
After
sin() it is required to place a number in ().

Well, the cot = cos/sin. So, if A1 is the angle in radians, then:
cos(A1)/sin(A1).

On the other hand, cot = 1/tan. So: 1/tan(A1).

But note that the Excel function parameter is in radians. If A1 has the
angle in degrees, then: 1/tan(radians(A1))