1 cos A cos B 3 sin A sin B 1 cos A...
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1 cos A cos B 3 sin A sin B 1 cos A cos B + sin A sin B cos A cos B - sin A sin B 3+1 3-1 1

JEE/Engineering Exams
Maths
Solution
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? Comg compendo- bicendo law [ begin{array}{l} frac{a}{b}-frac{c}{d} Rightarrow frac{a+b}{a-b}=frac{c+d}{c-d} end{array} ] ( frac{operatorname{Th} mu}{sin A sin B}=frac{3}{1} ) [ Rightarrow frac{cos A cos B+sin A sin B}{cos A cos B-sin A sin beta}=frac{3+1}{3-1} ]
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