1.

If the general solution of sin x + 3 sin 3x + sin 5 x = 0 " is " x = y then the set of all values of cos y is

Answer»

`{-1,-(SQRT(3))/(2),(sqrt(3))/(2),1}`
`{-1,(1)/(2),1}`
`{-(sqrt(3))/(2),0,1,(sqrt(3))/(2)}`
`{-1,-(1)/(2),(1)/(2),1}`

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