MCQ
Which of the following is not defined?
- A$\cos 0^{\circ}$
- B$\tan 45^{\circ}$
- ✓$\sec 90^{\circ}$
- D$\sin 90^{\circ}$
✓
Answer
Correct option: C.
$\sec 90^{\circ}$
(C) $\sec 90^{\circ}$
By using definitions of various trigonometric ratios, we find that $\sec 90^{\circ}$ is undefined.
AUTER $\sec 90^{\circ}=\frac{1}{\cos 90^{\circ}}=\frac{1}{0}$, which is undefined.
By using definitions of various trigonometric ratios, we find that $\sec 90^{\circ}$ is undefined.
AUTER $\sec 90^{\circ}=\frac{1}{\cos 90^{\circ}}=\frac{1}{0}$, which is undefined.
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