How would I solve these problems?

(5pts) Evaluate the following limits x2 -16 (a) limr-4 7-4 (b) limn-9 Vt-3 t-9 (ci limz-+-3 Va+4-1 x+3 (5pts) Find the derivative the of the following functions (a) f(x) - 27 sin(a) (b) g(x) = 1+72+10x -6x7 +5r+1x (c) h(x) = ex2+cos(x) (d) m(t) = In(tan(t) ) (e) k(y) = esin(y2)