a) Find the equation of the tangent line(s) to the given set of parametric equations at the given point. x=t^{2}+5 t-6 \quad y=t^{2}+2 t-8 \quad \text { at } \quad t=-1 Set up, but do not evaluate, an integral that gives the length of the parametric curve given by the set of parametric equations. You may assume that the curve traces out exactly once for the given range of t. x=\ln \left(t^{3}+7\right) y=\frac{1}{t^{2}-5} -2 \leq t \leq 5