Question

sec(tan^-1(1)) = ? without using calculator

Answer 1

\(\bf tan^{-1}(1)=\theta\implies tan(\theta)=1\qquad thus\qquad \theta=\square ?\)

Answer 2

but I cannot use calculator!!

Answer 3

There are some angles people memorize sin, cos and tan of:
0º, 30º, 45º, 60º and 90º

Answer 4

well, use a Unit Circle, I assume you have one

Answer 5

theta = 45

Answer 6

now sec??