$6x^3+4x-16$

$\left(x^6+12x^3+36\right)\left(x^6-16x^3+64\right)$

$\lim_{x\to\infty}\left(\frac{ln\left(10x+3\right)}{ln\left(3x+7\right)+1}\right)$

$3x^2-2xy^2=4xy+3$

$-9\cdot\left(-7.3\right)$

$x\left(7y+36\right)+4x^2+15y^2+45yx\left(7y+36\right)+4x\:2\:+15y\:2\:+45$

$xsen\left(y\right)=x$