$\frac{dy}{dx}=sec\left(6x\right)=\frac{3}{y}$

$\cot\left(x\right)\sin\left(x\right)^2=\cos\left(x\right)$

$-x-8-x$

$\ln\left(x-49\right)-ln\left(x+49\right)=-\frac{2}{5}$

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

$y^2+16y-64$

$\left(x+2y\right)^3-z\left(2y+x\right)^2+a\left(5x+10y\right)$