$\left(\frac{2}{3}x^2\:+\:\frac{1}{4}y\right)^2$
$\cos^241-\sin^241$
$16x-28-21$
$-2x-6\ge0$
$\left(-3-1\right)\cdot\left(-7-2\right)$
$\left(2x^3\:+\:5x\:-\:3\right)\left(4x\:-\:3x^2\:+\:2x^3\right)$
$15xy\:-3x^2\:-\:4y^2\:-\:3x^2\:-\:4y^2$
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