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Evaluate V4-x2 dx . Solution Let x = 2 sin(@), where _" se s _. Then dx = de and V 4 - x2 = V 4 - 4 sin2(0) = V 4 cos2(8) = 2|cos(@)| = 2 cos(@). (Note that cos(@) 2 0 because _ 0 in the diagram, this expression for cot(@) is valid even when e