Solve the problem.
-For what numbers $\theta$ is $f ( \theta ) = \sec \theta$ not defined?
A) all real numbers
B) odd multiples of $\pi \left( 180 ^ { \circ } \right)$
C) integral multiples of $\pi \left( 180 ^ { \circ } \right)$
D) odd multiples of $\frac { \pi } { 2 } \left( 90 ^ { \circ } \right)$

Question

Quizplus · Accepted Answer

The function $f(\theta) = \sec \theta$ is not defined when $\cos \theta = 0$, which occurs at odd multiples of $\frac{\pi}{2}$ (or $90^\circ$). This is because $\sec \theta = \frac{1}{\cos \theta}$, and division by zero is undefined.

Solve the Problem θ\thetaθ Is f(θ)=sec⁡θf ( \theta ) = \sec \thetaf(θ)=secθ

Solve the Problem $\theta$ Is $f ( \theta ) = \sec \theta$