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Marin Crosby
Mathematics
20 October, 15:35
If cos 3 A = sin (A-22), find A
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Emilee Neal
20 October, 15:41
0
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)
A = 28
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