F-4. If y 10 Na the number of solut...
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F-4. If y 10 Na the number of solutions of the equation sin 7x + sin 4x + sin x = 0 is: 48) 5 (C) 6 (D) 4 (A) 3

JEE/Engineering Exams
Maths
Solution
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( pi=n pi ) ( x=frac{n pi}{9}, n in 2 ) ( 3 x=2 n+frac{5}{6} ) ( x=frac{2 x y}{3} pm frac{57}{18} ) ( x in[0, pi / 2] ) ( x=n pi / 4 ) ( n=0 cdot x=0 ) ( n=1 quad x=pi / 4 ) ( n=2 quad x=pi / 2 ) ( sum_{t} 170(0, pi / 2) )
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