Task $2(5$ points each$).$

Differentiate the following functions:

$u=\frac{10cosx-x^3}{\text{e}\text{x}\text{p}(x^2)},s=\frac{t^3-(t+1{)}^2}{ln(\frac{1}{t})},y=sin(exp((sinx{)}^2))$

$($a$)\frac{du}{dx}$

$($b$)\frac{ds}{dt}$

$($c$)\frac{dy}{dx}$