Are the following statements correct?

n$)2=$O$($n$)3)?$

$33$n$=$O$(3$n$)?$

Use the definition $((0<=$fn$<=$cg$($n$)))$ of big O to proof your answers.

$($Note: If any of them is correct, you should find c and n$0$ such that the inequality holds for any n$0>=$ n$.$ If they are wrong, you should show that there is no possible constant c$.$ You can find examples of the proof for both wrong and correct cases in the slides.$)$