we know that ${\color{Magenta}{{x\oplus y}=x\overline{y}+\overline{x}y}}$
Now ${\color{Green}{{x\oplus 1}=x\cdot\overline{1}+\overline{x}\cdot1=x\cdot 0+\overline{x}=\overline{x}}}$
and ${\color{Blue}{{x\oplus 0}=x\cdot\overline{0}+\overline{x}\cdot0=x\cdot 1+0=x}}$