$\left(sin\left(\frac{x}{2}\right)-cos\left(\frac{x}{2}\right)\right)^2$
$-16-14n$
$\left(\frac{5x^{-3}y^{-6}z^2}{4x^{-2}y^2z^{-4}}\right)^{-2}$
$x^2-1-8x^4-3x^2+5x+4-5x^4+2x^2-4x$
$\frac{1}{4}x^2-25y^2$
$\left(\frac{m^6t}{7}\right)^2$
$6x^2-12x+12$
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