$-\left(7-2\right)+\left(-\left(9-\left(14-5\right)+3\right)\right)+8$

$2x^3+x^2-5x+2$

$2x^2+8x+21$

$\left(-6\right)\left(7+8\right)$

$\frac{x^4}{1-x^2}$

$\frac{dx}{dt}=\frac{\left(1+x^2\right)\pi t}{12\sqrt{1-t^2}}$

$z=\arcsin\left(x-y\right),\:x=s^2+t^2,\:y=1-2st$