$\int_2^5\left(2x\right)dx$
$tan\left(s-t\right)=\frac{\left(tan\left(s\right)-tan\left(t\right)\right)}{1+tan\left(s\right)tan\left(t\right)}$
$x^3-20x^2+33x+54$
$x-4<-3$
$-4x^2+12xy-9y^2$
$-15\:+\:-25\:+\:-35\:+-45\:+-55$
$\frac{9}{2}=4+cos\left(x+\frac{\pi}{2}\right)$
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