$\frac{\left(x^3-2x^2-3x-4\right)}{x^2+1}$

$\int_3^{\infty}\left(\frac{1}{2x-1}\right)dx$

$\left(-4abc-2xy^3\right)^2$

$3+2\cdot cos\left(x\right)-2\cdot sin\left(x\right)\cdot ctg\left(x\right)$

$\sec\left(y\right)-\tan\left(y\right)\cdot\sin\left(y\right)=\frac{1}{\sec\left(y\right)}$

$\frac{6^{14}}{6^8}$

$\frac{ln\left(x^7\left(x-2\right)^6\right)}{\left(x^2+3\right)^2}$