$\frac{dy}{dx}\cdot x=\left(y+\left(\frac{x}{tan\left(\frac{y}{x}\right)}\right)\right)$

$\int\left(\frac{sin\left(x\right)}{2x}\right)dx$

$-4\left(1-a\right)-2a\left(1-6a\right)$

$4+3\cdot6-2\cdot7$

$\log_{0.001}\left(0.0001\right)$

$887-139$

$\left(2x-5y^4\right)^4$