Question

which relationship in the triangle must be true? a b c c a b o sin(b) = sin(a) o sin(b) = cos(90 - b) o cos(b) = sin(180 - b) o cos(b) = cos(a)

Explanation:

Step1: Recall co - function identity

We know that $\sin\theta=\cos(90^{\circ}-\theta)$.

Answer:

$\sin(B)=\cos(90 - B)$