$a^5+a^4+a+1$

$e=\frac{\sen20^{\circ}}{\cos70^{\circ}}+\frac{\tg35^{\circ}}{\ctg55^{\circ}}$

$-\frac{dy}{dx}+y=1$

$\left(-\frac{3}{2}m^2\right)\cdot\left(-\frac{y}{14}a^2m^3\right)$

$\sqrt[2]{b}\cdot\sqrt[4]{b^3}$

$\left(-59\right)-\left(-59\right)$

$cos^2x-cos^4x=\frac{1-cos4x}{8}$