cos α =3/5
cos β = 4/5
find value of cos( α - β)/2
assuming α and β to be acute angles
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as we know
if cos alpha = 3/5
then alpha = 53
and cos beta = 4/5
that means beta = 37
So cos ( alpha -beta)/2 = cos( 53-37)/2 = cos 16/2 = cos 8 =0.99
if cos alpha = 3/5
then alpha = 53
and cos beta = 4/5
that means beta = 37
So cos ( alpha -beta)/2 = cos( 53-37)/2 = cos 16/2 = cos 8 =0.99
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