$+6-4\cdot2$

$cos\left(5x\right)=0$

$\frac{x^3+x}{x^4-1}$

$\int\frac{e^x}{e^{2x}-4}dx$

$\left(2xyv\:-\:6ab\right)\:\left(2xyv\:+\:6ab\right)\:$

$\left(6^2-2\right)\left(-5\right)$

$\sec\left(x\right)^2-\frac{13}{30}=\frac{1}{\sin\left(x\right)^2\cdot\cos\left(x\right)^2}$