$\frac{d^2}{dx^2}\left(\frac{x+5}{x}\right)$

$\sin x\cdot\cos x+\sin2x=3\cdot\sin x\cdot\cos x$

$\frac{x-1}{x+1}>2$

$\:\frac{x^6+64}{x+2}$

$\left(\frac{sin\left(u\right)}{cos\left(u\right)}\right)\left(\frac{cos\left(v\right)}{cos\left(v\right)}\right)-\left(\frac{cos\left(u\right)}{cos\left(u\right)}\right)\left(\frac{sin\left(v\right)}{cos\left(v\right)}\right)$

$\left(3x^2\:-\:2x\:+\:7\right)\:\left(x\:-\:9\right)$

$\left(2x-3\right)\left(x+3\right)$