Show that $$f ( x ) = ( x + 2 ) \log _ { 2 } \left( x ^ { 2 } + 1 \right) + \log _ { 2 } \left( x ^ { 3 } + 1 \right) \text { is } O \left( x \log _ { 2 } x \right)$$

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The Answer of Show that $$f ( x ) = ( x + 2 ) \log _ { 2 } \left( x ^ { 2 } + 1 \right) + \log _ { 2 } \left( x ^ { 3 } + 1 \right) \text { is } O \left( x \log _ { 2 } x \right)$$

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