if cot(-180 degrees)

would you add 360 to get positive 180

then do cot (180) to get 1/0 or undefined

my second problem is if tan= 1.3

what is the value of (cot-angle)

I am not sure how to do this.

Can anyone help me please?

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- December 20th 2010, 11:38 AMhomeylova223Unit circle and right angle problem?
if cot(-180 degrees)

would you add 360 to get positive 180

then do cot (180) to get 1/0 or undefined

my second problem is if tan= 1.3

what is the value of (cot-angle)

I am not sure how to do this.

Can anyone help me please? - December 20th 2010, 12:00 PMhomeylova223
Also I am trying to find the tan of 150 degrees

so I have to dive (1/2)/(- square root 3/2) can anyone also show me how to do this. - December 20th 2010, 12:15 PMArchie Meade
A clockwise movement of brings us to the same position on the unit-circle

as a counterclockwise rotation of

Hence

For

hence the cotangent of that angle is undefined.

For cotangent, you only need know that it is the reciprocal of tangent.

In the unit-circle,

and

Therefore