$\lim_{x\to0}\left(\frac{\ln\left(x+3\right)-1}{x}\right)$

$\left(2a^{3}y^{2}z-5ay^{3}z^{2}\right)\left(2a^{3}y^{2}z+\san^{3}z^{2}\right)$

$2\cdot\left(-5-4\right)-\left(-6\right)\cdot\left(-1+3\right)-\left(+4\right)\cdot\left(+2\right)$

$x^2-3x+4>0$

$\int\:\frac{4x^5-4x^3-x+2}{4x^3+4x^2}dx$

$\int\left(3-6x\right)^5dx$

$7.x-13<3.x-1$