Question

Determine o valor de sec π/4

Answer 1

sec(x) = $\frac{1}{cos(x)}$
$sec( \frac{ \pi }{4}) = \frac{1}{cos( \frac{ \pi }{4} )} = \frac{1}{ \frac{ \sqrt{2} }{2} } = \frac{2}{ \sqrt{2} } = \frac{2 \sqrt{2} }{2} = \sqrt{2}$