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

$\left(\frac{6x^{-8}\cdot y^{-3}}{18x^4y^{-5}}\right)^{-1}$

$f\cos\left(x\right)=n\sin\left(45\right)$

$\frac{dy}{dx}=y+2xe^x$

$\frac{dy}{dx}\left(\frac{x\sqrt{x^3+3}}{\left(x+1\right)^2}\right)$

$\int\left(x\cdot\left(\sqrt[3]{x}-\sqrt[4]{x}\right)\right)dx$

$9-\:6\:-\:\left[\:\left(-32\:-\:15\:+8\right)\:-\:22\right]\:-\:7$