$-11-\left(-3\right)$

$81t^2-18t+1$

$\frac{\left(2^{6x}\cdot\left(2x+2\right)\right)}{\left(2^{4x}\cdot\left(x+1\right)\right)}$

$\left(\frac{1}{5}-x\right)\left(\frac{1}{7}+x\right)$

$y\cdot ln\left(y\right)dx-xdy=0$

$9x^6-4y^2$

$\int_2^{\infty}\left(\frac{2x}{x^2-3}\right)dx$