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Don’t understand how to do this can somebody explain and answer, need badly

Don’t understand how to do this can somebody explain and answer, need badly-example-1
User JoshWillik
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Whenever we are looking for an angle we have to use inverse trig. In this case, we have an adjacent side and a hypotenuse. From SOHCAHTOA, this tells me we have to use inverse cosine.

invcos (12/31) = 67 degrees
User Radames
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