SOLUTION: the problem states: for which numbers x, 0<=x<2pi, are teh following functions NOT defined? 9. tan x i dont understand can you help with step by step explaination?

Question 144455: the problem states:
for which numbers x, 0<=x<2pi, are teh following functions NOT defined?
9. tan x
i dont understand
can you help
with step by step explaination?
Answer by nabla(475) (Show Source): You can put this solution on YOUR website!
The tangent function is defined as:
Tan(θ)=Sin(θ)/Cos(θ)
Now, what can we not divide by in the system of real numbers? Correct, 0.
So Cos(θ) cannot equal zero. This occurs at 90 degrees and 270 degrees. (The x value is zero on the unit circle.) In radians, and
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