$cos4x=-\frac{1}{2}$
$\frac{1}{3}\left(\frac{36}{25}q^{4\:}+81y^2-d^2\right)$
$x^3-p^3$
$\int_0^{a^2}\sqrt{a^2-x^2}xdx$
$abc-abd$
$\left(9a+\frac{1}{6}\right)^2$
$1x^2+6x+c$
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