$\lim_{h\to0}\left(\frac{\left(x-h\right)^{\frac{1}{3}}-x^{\frac{1}{3}}}{h}\right)$

$\int\left(x^{12}e^{-x^{13}}\right)dx$

$\int\left(x-1\right)\tan\left(x^2-2x\right)dx$

$\left(2x^3-6x^2+5x\:-8\right):\left(x+4\right)$

$\int\frac{1}{xln\left(x\right)\sqrt{2ln\left(x\right)-1}}dx$

$-5\left(a\:-\:2\right)\:+\:15\:=\:-3a\:+\:25\:-\:2a$

$5x-12<3x-15$