if A=60 and B= 30 verify that cos [A-B]= cos A cos B +sinA sinB
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cos(60-30)=cos60.cos30+sin60.sin30
√3/2= 1/2.√3/2+√3/2.1/2
= √3/4 +√3/4
=2√3/4
=√3/2
√3/2= 1/2.√3/2+√3/2.1/2
= √3/4 +√3/4
=2√3/4
=√3/2
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