$4.5+1.9+8$

$\frac{\sin\left(x\right)\tan\left(x\right)}{\tan\left(x\right)-\sin\left(x\right)}=\frac{\tan\left(x\right)+\sin\left(x\right)}{\sin\left(x\right)+\tan\left(x\right)}$

$pdo+odp$

$\left(\frac{1}{5}x^2+x\right)^{\frac{-2}{3}}$

$x+7\ge-1$

$\frac{d}{dx}\left(5^y\cdot y^7\right)$

$3-6-2+5+2+6$