find cos 75 if cos(A+B)= cosA.cosB-SinAsinB
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cos75 = cos (45+30)
=cos45.cos30- sin45.sin30
=1/root2×root3/2 -1/root2×1/2
= root3/2root2 - 1/2root2
=(root3-1) /2root2
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