Question

The value of $\sec \left({\sec }^{-1}5\right)$ is

• A. 5
• B. 5.00
• C. 5.0
• D. 05

Answer 1

Answer: (A), (B), (C), (D)

We know that $\sec \left({\sec }^{-1}x\right)=x$ when $x\in (-\infty ,1]\cup [1,\infty )$
and clearly $5\in (-\infty ,1]\cup [1,\infty )$
Hence, $\sec \left({\sec }^{-1}5\right)=5$