Ex1 d x d y = x 2 y 2 {\displaystyle {dx \over dy}={x^{2} \over y^{2}}}
y 2 ∗ d y = x 2 ∗ d x {\displaystyle y^{2}*dy=x^{2}*dx}
∫ y 2 ∗ d y = ∫ x 2 ∗ d x {\displaystyle {\int y^{2}*dy}={\int x^{2}*dx}}
