032) Cosa + cosy + c05a=0 Sin x+sin...
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032) Cosa + cosy + c05a=0 Sin x+sinyt sina=0 Cot(*+y= a sin a b cosa o cot a do sin saty i

JEE/Engineering Exams
Maths
Solution
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ns ( cos x+cos y=-cos alpha ) ( sin x+sin y=-sin alpha ) ( frac{2 cos left(frac{x+y}{2}right) cos left(frac{x-y}{2}right)}{2 sin left(frac{x+y}{2}right) cos left(frac{x-y}{2}right)}=frac{cos x}{sin alpha} ) ( cot left(frac{x+y}{2}right)=cot alpha )
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