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\( E _ { - 2 } \) \( x \geq 1 \) \( ( 1 ) \) (iii) \( \quad f ( x ) = \sqrt { 1 + x + x ^ { 2 } } - \sqrt { 1 - x + x ^ { 2 } } \) (ii) \( \quad f ( x ) = \frac { \sec x + x ^ { 2 } - 9 } { x \sin x } \)

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