Verified Answer :

penfila11Pen

I am not quite sure what the question asks for,
But this is what i assume it wants:

Cos A= 0.6489
In this given one, we basically find the size of the angle A
we do cosine inverse on both sides to get the size of the angle A
\(cos^{-1}\) : It looks like this in the calculator
\(cos^{-1}\) × cos A=\(cos^{-1}\)(0.6489)
(\(cos^{-1}\) and cos cancels out)
A=\(cos^{-1}\)(0.6489)
A=49.54°
check: 
cos 49.54=0.6489 (its right!)

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