2. The value of f cos 6 0 + 6 cos 4...
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2. The value of f cos 6 0 + 6 cos 40 + 15 cos 20 + 10 10 is : cos 50 + 5 cos 30 + 10 cos 0 (A) sin 0 (B) 2 sin 0 (C) cos e (D) 2 cos e

JEE/Engineering Exams
Maths
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( frac{cos 6 theta+6 cos 4 theta+15 cos 2 theta+10}{cos 5 theta+5 cos 3 theta+10 cos theta} ) ( =frac{(cos 6 theta+cos 4 theta)+5(cos 4 theta+cos 2 theta)+w(cos 2 theta+1)}{cos 5 theta+5 cos 3 theta+10 cos theta} ) ( =2 cos theta+frac{2 cos theta}{cos 5 theta+5 cos 3 theta+cos theta} )
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