Find the gradient of the curve
$$3 \ln x + 4 \ln y + 6 x y = 6$$
at the point \(( 1,1 )\).
The parametric equations of a curve are
$$x = \frac { 10 } { t } - t , \quad y = \sqrt { } ( 2 t - 1 ) .$$
Find the gradient of the curve at the point \(( - 3,3 )\).