Find a cofunction with the same value as the given expression.
-$\sin 20 ^ { \circ }$
A) $\cos 70 ^ { \circ }$
B) $\cos 20 ^ { \circ }$
C) $\tan 70 ^ { \circ }$
D) $\cot 70 ^ { \circ }$

Question

Quizplus · Accepted Answer

The sine and cosine functions are cofunctions of each other, with their values related by the identity $\sin(\theta) = \cos(90^\circ - \theta)$. Therefore, $\sin(20^\circ) = \cos(70^\circ)$.

Find a Cofunction with the Same Value as the Given sin⁡20∘\sin 20 ^ { \circ }sin20∘

Find a Cofunction with the Same Value as the Given $\sin 20 ^ { \circ }$