$\log_{13}\left(x\right)=\log_{13}\left(6\right)+\log_{13}\left(5\right)-\log_{13}\left(2\right)$

$-5+7-\left(-8\right).2:\left(-4\right)$

$\frac{dy}{dx}\left(2x^2y-4y^3=4\right)$

$\frac{1}{3}\int\left(\frac{1}{\tan\left(x\right)}\right)dx$

$n^2-3n+28=0$

$2y+5y^2+3y^3$

$b^5+5b^3$