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If exp [(sin^(2)x+sin^(4) x +sin^(6)x+.....

If exp `[(sin^(2)x+sin^(4) x +sin^(6)x+.... oo)" In" 2]` satisfies the equation `y^(2)-9y+8=0`, then the value of `(cos x )/( cos x+ sin x ),0 lt x lt (pi)/(2)` , is

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