Evaluate the integral.

${\displaystyle \underset{4}{\overset{9}{}}}\frac{7cosh(\sqrt[\phantom{2}]{x})}{\sqrt[\phantom{2}]{x}}dx$

${\displaystyle \underset{4}{\overset{9}{}}}\frac{7cosh(\sqrt[\phantom{2}]{x})}{\sqrt[\phantom{2}]{x}}dx=$

$$

$($Type an exact answer.$)$