1.

Which of the following is a solution of cos3x=(1)/(2)?

Answer»

`60^(@)`
`(5pi)/(3)`
`COS^(-1)((1)/(6))`
`1/3cos^(-1)((1)/(2))`

Solution :`3x=arc cos`, and so `x=(1)/(3)`arccos`((1)/(2))`


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