9) - Ls (2X + 2y). 33. ( (i) If cot...
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9) - Ls (2X + 2y). 33. ( (i) If cot x cot y = 2, show that cos (x + y)_1 cos(x - y) 3

JEE/Engineering Exams
Maths
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( cot x cot y=2 ) ( Rightarrow quad cos n cos y=2 sin n sin y ) -1 ( =frac{cos (x+y)}{cos (x-y)}=frac{cos x cos y-sin x sin y}{cos x cos y+cos x sin y} ) By (1)( Rightarrow frac{text { sinnsing }}{3 text { sinnsing }} ) [ =1 / 3+frac{1-y}{2} ]
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