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

$2xy-y+3x;\:x=-3;\:y=2$

$\left(6x+1\right)^2$

$\left(4m+3n^3\right)^2$

$\left(5c-3d\right)^2-\left(4a-1\right)^2$

$\left(3x^2+5\right)\tan\left(y\right)dx\:+\:\left(1-x\right)\sec^2\left(y\right)dy$

$\frac{\sin\left(\frac{8\pi}{7}\right)}{\frac{1}{4}}$