Question

15 Points!

Find the exact value of the real number y.

y = arcsec (1)

A) -π

B) pi divided by two

C) 0

D) π

Answer 1

C) 0

Explanation:

Arcsec (1)= cos1

Then look at unit circle cos=1 at 0 or 2pi

Answer 2

`y=arc\sec x\iff x=\sec y\\\\y=arc\sec1\iff1=\sec y\\\\\to(1)/(\cos y)=1\to\cos y=1\to y=2k\pi;\ k\in\mathbb{Z}`
Answer: C) 0