$2sinx\cdot cosx\cdot cotx\:=1$

$\left(8x-5y+1\right)dx=-\left(6y^2-5x\right)dy$

$\int\left(y^{-3}e^{-4}\right)dy$

$f\left(x\right)=\tan\left(-1\right)\left(\frac{x}{y}\right)$

$\frac{1}{2}\left(xy\right)^{-\frac{1}{2}}$

$\left(-10m^6b\right)\left(-5m^2b^3\right)$

$2x^2+9x-11=0$