Use your results from problem 7-27 to integrate each expression below. What do each of the problems have common?

1. $\int ( 6 x ) ^ { 19 } d x$ 

   Steps (a):

   $=\int 6^{19}x^{19}dx=6^{19}\int x^{19}dx= ?$

   Do not forget the $+C$ at the end of the answer.

2. $\int_{ }^{ }\sec^2(6x)dx$ 

   Answer (b):

   $=\frac{1}{6}\text{tan}(6x)+C$

   Explain where the coefficient, $\frac{1}{6}$, came from.

3. $\int \frac { d x } { 6 x }$ 

   Hint (c):

   $=\frac{1}{6}\int \frac{1}{x}dx=$