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Answer:
(b) 62°
Explanation:
The mnemonic SOH CAH TOA reminds you of the relation between sides and angles. Here, the relevant relation is ...
Cos = Adjacent/Hypotenuse
cos(x) = 9/19
The inverse function is used to find the angle
x° = arccos(9/19) ≈ 61.73°
The missing value of x is about ...
x ≈ 62