\displaystyle\frac{\frac{\cos(14x)-1}{(14x)^2}\cdot\frac{e^{68x}-1}{68x}\cdot 14^2\cdot 68\cdot x+\frac{e^{68x}-1}{68x}\cdot\frac{68}{x}+\frac{\cos(14x)-1}{(14x)^2}\cdot 14^2}{\frac{\tan^2(4x)}{(4x)^2}\cdot 4^2\cdot (\sqrt{\cos(14x)}e^{34x}+1)}