$\left(\frac{3x^2y^3}{2xy^4}\right)^3$
$\left(3k^{4}\right)^{4}$
$x^4-2\left(a^2+b^2\right)x^2+\left(a^2-b^2\right)^2$
$5x-3<2x+9$
$\left(2a+5\right)\left(2a-3\right)$
$354.5-231.45$
$3\sin\:^2x-2=1-3\cos\:^2x$
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