1.

( a ) \quad \operatorname { log } _ { 2 } 5 + \operatorname { log } _ { 2 } ( x ^ { 2 } - 1 ) - \operatorname { log } _ { 2 } ( x - 1 ) ( b ) \quad 2 \operatorname { log } _ { 4 } 9 - \operatorname { log } _ { 2 } 3 \quad ( c ) \quad 3 ^ { 2 \operatorname { log } _ { 3 } 5 }

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