Sin 7A = cos 3A, then m∠A is what?

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Cfranco asked Sep 16, 2022

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Sin 7A = cos 3A, then m∠A is what?

Mathematics
high-school

Cfranco asked Sep 16, 2022

by Cfranco

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Answer:

m∠A = 9°

Explanation:

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

Patrick Glandien answered Sep 23, 2022

by Patrick Glandien

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