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If ex[ [(sin ^(2) x + sin ^(4) x + sin^(6) x + . . .. " to "infty) " In " 2 ]is a root of the equation y ^(2) - 9 y + 8 = 0 , then the valueof (cos x)/( cos x + sin x), 0 lt x lt (pi)/(2) is |
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Answer» `sqrt(2) - 1` |
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