How do you graph tangent and cotangent functions?

1 Answer
Jul 27, 2018

See combined graph.


tan and cot are reciprocal functions.

See the combined graph of y = tan x and y = cot x, to realize that

each is the reciprocal of the other.
graph{(y- tanx )(y - cot x )(y^2-1)=0}

They meet at #y = +- 1#. Zeros of one are #+- oo#, for the other.

Separate graphs. for y = tan x and y = cot x:
graph{y-tan x = 0}
graph{y-1/tan x = 0}