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 [tex] cos^{-1} [/tex] : It looks like this in the calculator [tex] cos^{-1} [/tex] × cos A=[tex] cos^{-1} [/tex](0.6489) ([tex] cos^{-1} [/tex] and cos cancels out) A=[tex] cos^{-1} [/tex](0.6489) A=49.54° check: cos 49.54=0.6489 (its right!)
