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"Find whether the following functions are even or odd\n(a) \\( \\mathrm { f } ( \\mathrm { x } ) = \\log \\left( \\mathrm { x } + \\sqrt { 1 + \\mathrm { x } ^ { 2 } } \\right) \\quad \\) (b) \\( \\mathrm { f } ( \\mathrm { x } ) = \\frac { \\mathrm { x } \\left( \\mathrm { a } ^ { \\mathrm { x } } + \\right. } { \\mathrm { a } ^ { \\mathrm { x } } } - \\)"

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