Please check my first answer and then help me with the second part.

\f( cos x +cosy )2 + ( sinx - sing ) = 2+ 2 cos ( xx7 ) COSZ * + coszy + 2 cosx . cosy + sim" *- 1jinx. sin) + sin ?y district 1 + coszy + Zeesxicosy - sing . cosy + sixty 2 + 2 (cosx . easy - sinxsing) factor 2 + 2 (cosx xy ) indentifyof Ces Part II: Find all solutions to the equation you found in part I.(4 points)