Question

Sin 7A = cos 3A, then m∠A is what?

Answer 1

m∠A = 9°

Explanation:

`\sin 7A = \cos 3A \\ \\ \sin 7A = \sin(90 \degree - 3A) \\ \\ 7A = 90 \degree - 3A\\ \\ 7A + 3A= 90 \degree \\ \\ 10A= 90 \degree \\ \\ A = (90 \degree)/(10) \\ \\ m \angle A =9 \degree`