Question

△abc. what are the angles that make the trigonometric statements true? sin( ) = cos(b) sin(b) = cos( )

Explanation:

Step1: Recall co - function identity

In a right - triangle, $\sin(A)=\cos(B)$ and $\sin(B)=\cos(A)$ when $\angle A+\angle B = 90^{\circ}$.

Answer:

First blank: A
Second blank: A