1.

For 0 lt x lt pi the values ofx which satisfy the relation 9^(1 + | cos x | + | cos^(2) x | + cos^(3) x | + …."upto" infty )= 3^(4) are given by

Answer»

`pm pi//4, pm 2 pi //3`
`pm pi //6, pm 2 pi //3`
`pm pi // 3, pm 2 pi //3`
`pm pi//2, pm 2 pi //3`

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