Solve the following differential equation explicitly. Use lower case c\displaystyle {c} for the constant of integration.

y1x2+1y2=0\displaystyle {y}'\sqrt{{{1}-{x}^{{2}}}}+\sqrt{{{1}-{y}^{{2}}}}={0}

Hint: Use the identities 11u2du=sin1(u)+c\displaystyle \int\frac{{1}}{\sqrt{{{1}-{u}^{{2}}}}}{d}{u}={{\sin}^{{-{{1}}}}{\left({u}\right)}}+{c}, 11u2du=cos1(u)+c\displaystyle -\int\frac{{1}}{\sqrt{{{1}-{u}^{{2}}}}}{d}{u}={{\cos}^{{-{{1}}}}{\left({u}\right)}}+{c} and sin(A+B)=sin(A)cos(B)+sin(B)cos(A)\displaystyle {\sin{{\left({A}+{B}\right)}}}={\sin{{\left({A}\right)}}}{\cos{{\left({B}\right)}}}+{\sin{{\left({B}\right)}}}{\cos{{\left({A}\right)}}}.