Question

At what which of the following sets of values is the tangent function undefined?(1 point)
Responses

at 60 and 120 degrees
at 60 and 120 degrees

at 90 and 180 degrees
at 90 and 180 degrees

at 90 and 270 degrees
at 90 and 270 degrees

at 45 and 135 degrees

Answer 1

at 90 and 270 degrees

Reason: tan θ = sin θ / cos θ, and cos θ = 0 at 90° and 270°, so the quotient is undefined.