Answer:
A = 28
Step-by-step explanation:
Using the cofunction identity
cos x° = sin(90 - x)°
with x = 3A , then
90 - 3A = A - 22 ( add 3A to both sides )
90 = 4A - 22 ( add 22 to both sides )
112 = 4A ( divide both sides by 4 )
54
