Question

Determine a derivada:

a) u = t + 5/ t - 7

Answer 1

   $\frac{d}{dt} (t + 5 t^{-1} -7) = 1. t^{1-1} +5(-1) t^{-1-1} -0 \\ \\ \frac{d}{dt} (t+ 5t^{-1} -7)=1- 5t^{-2}$