2.2.68 Derivatives and Differentials
Condition: make sure that the given expression is a complete differential \ (d u \) and find \ (u \). \ [\ frac {2 x \ left (1-e^{y} \ right)} {\ left (1+x^{2} \ right)^{2} D X+\ FRAC {E^L}} {2 LEAR}} D YA EL
Calculation of derivatives and differentials of first and Higher Orders of Function of One and Many Varia Bybles, Including Partial Derivatives.