#### Answer

The identity sec α = $\frac{1}{cos α}$ is valid

#### Work Step by Step

sec α = $\frac{c}{b}$
cos α = $\frac{b}{c}$
$\frac{1}{cos α}$ = $\frac{1}{\frac{b}{c}}$ = $\frac{c}{b}$
So sec α and $\frac{1}{cos α}$ are equivalent

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Cengage

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The identity sec α = $\frac{1}{cos α}$ is valid

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