Question

find the differential of y=(1-v^2)/(1+v^2)

Answer 1

\[y'=-2v(1+v ^{2})-(1-v ^{2})(2v)/(1+v ^{2})^{2}\]
\[[(-2v-2v ^{3})-(2v-2v ^{3})]/(1+v ^{2})^{2}\]
\[-2v-2v ^{3}-2v+2v ^{3}/(1+v ^{2})^{2}\]
\[-4v/(1+v^2)^2\]