1.

Find all values of x in (-pi,pi) satisfying the equation 8^(1+cosx+cos^(2)x+...)=4^(3).

Answer»

`(PI)/(3),(2PI)/(3)`
`(pi)/(3),(-2pi)/(3)`
`(-pi)/(3),(2pi)/(3)`
`PM(pi)/(3),pm(2pi)/(3)`

ANSWER :D


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