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

$\left(4m+6n\right)^2$

$\int\frac{2}{\left(x^2-4x+5\right)^{\frac{3}{2}}}dx$

$\left(2m+1\right)^3.\left(2m+3\right)\left(2m-5\right)-\left(2m+4\right)^2$

$-25x^2+4y^2-8y-50x-121=0$

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

$\frac{1}{2}a-\frac{3}{4}a+\frac{3}{8}a$