Write the function in terms of its cofunction. Assume that any angle in which an unknown appears is an acute angle.
-$$\cos 47 ^ { \circ }$$
A) $\sin 47 ^ { \circ }$
B) $\sin 43 ^ { \circ }$
C) $\cos 137 ^ { \circ }$
D) $\sec 43 ^ { \circ }$

Question

Quizplus · Accepted Answer

The cofunction identity states that $\sin(90^\circ - \theta) = \cos(\theta)$ for acute angles. Therefore, $\cos(47^\circ) = \sin(90^\circ - 47^\circ) = \sin(43^\circ)$.

Write the Function in Terms of Its Cofunction cos⁡47∘\cos 47 ^ { \circ }cos47∘

Write the Function in Terms of Its Cofunction $\cos 47 ^ { \circ }$