$x^4-36x^2$
$- 3 ( 2 + 4 k ) + 7 ( 2 k - 1 )$
$\int\left(\sin\left(-4x\right)\right)dx$
$3a\sqrt{108a^7}$
$9\sec^2x\:-5\tan^2x$
$\frac{7}{x-3}=\frac{4}{x+6}$
$-4+5\left\{1\left[11\left(-2+2\right)-10\right]\right\}+3$
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