Without using a calculator, give the exact trigonometric function value with rational denominator.
-$\sec 45 ^ { \circ }$
A) $\frac { 2 \sqrt { 3 } } { 3 }$
B) 1
C) $\frac { 1 } { 2 }$
D) $\sqrt { 2 }$

Question

Quizplus · Accepted Answer

$\sec 45^\circ = \frac{1}{\cos 45^\circ} = \sqrt{2}$, because $\cos 45^\circ = \frac{\sqrt{2}}{2}$.

Without Using a Calculator, Give the Exact Trigonometric Function Value sec⁡45∘\sec 45 ^ { \circ }sec45∘

Without Using a Calculator, Give the Exact Trigonometric Function Value $\sec 45 ^ { \circ }$