If exp. {(sin^2x+sin^4x+sin^6x+…inf.) In...

If exp. `{(sin^2x+sin^4x+sin^6x+…inf.) In2}` satisfies the equation `x^2-9x+8=0` find the value off `(cosx)/(cosx+sinx), 0ltxlt pi/2`

`(1)/(2) (sqrt(3) + 1)`

`(1)/(2) (sqrt(3) - 1)`

none of these

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