$\frac{4x^5-3x^4+2x^3-5x+1}{4x-2}$

$\left(d^3+4d\right)y=sin5xcos3x$

$100x^6+200x^6+x^6$

$\lim\:_{x\to\:\infty\:\:\:}\left(\frac{e\left(x+1\right)}{\left(x+2\right)}\right)$

$7 x ^ { 4 } y + 5 x ^ { 2 } y + 10 x$

$\lim_{x\to1}\left(\frac{x+1}{x-2}\right)$

$\left(6jk+4mn\right)\left(6jk-4mn\right)$