Question

The value of $\sec {90}^{\circ }$ is

• A. $1$
• B. $\frac{2}{\sqrt{3}}$
• C. $\sqrt{2}$
• D. None of these

Answer 1

Answer: (D)

None of these

$\sec 90°=\frac{1}{\cos 90°}=\frac{1}{0},$ undefined.

Hence, the answer is none of these.