$\frac{\frac{1}{\csc\left(x\right)}}{1-\cos\left(x\right)}-\frac{\frac{\csc\left(x\right)}{1}}{1}$

$\frac{x-5}{3}+\frac{x+4}{2}>\frac{x+3}{6}$

$\left(7a+b\right)+\left(-3a-4b\right)$

$2x^2+5x+9x^2$

$\ln\left(\frac{e^x}{x}\right)$

$\frac{45}{89}-0.9908-\frac{55}{378}$

$20+90+515f$