10. 1 - cos A + cos B - cos(A + B) ...
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10. 1 - cos A + cos B - cos(A + B) = tan 1 + cos A - cos B - cos(A + B) А 2 В 20

JEE/Engineering Exams
Maths
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( +cos A-cos B-cos A+B ) ( operatorname{sen}left(frac{B}{2}right. ) ( =2 cos ^{2} frac{A}{2}-[cos B+cos (A+B)] ) ( =2 cos ^{2} frac{A}{2}-left[2 cos alphaleft(frac{beta+A+B}{2}right) sin left(frac{B-A-B}{2}right)right] ) ( =2 cos frac{2 theta}{2}-2 cos left(frac{A}{2}right) cos left(frac{2 B+A}{2}right) ) ( =2 cos frac{A}{2}left[cos frac{A}{2}-cos (2 B+A)right] ) ( =2 cos frac{theta}{2}left[2 sin left(frac{pi}{2}+frac{26+4}{2}right) sin frac{2 B+A-frac{A}{2}}{2} alpha_{0}right) ) ( 2 cos frac{A}{2}left[2 sin left(frac{alpha+beta}{2+beta}right) sin left(frac{B}{2}right)right] )
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