if tanA =1,tanB= root3 evaluate cos A cos B - sin A sin B
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A=45
B=60
now,
cos A cos B - sin A sin B
=cos 45 cos 60 - sin 45 sin60
=1/root2×1/2 -1/root2×root3/2
=1/root2 (1/2×root3/2)
=root3/4×root2
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