$\left(-6x-y^2\right)\left(-6x+y^2\right)$
$x^2-3x+15^2$
$\tan^2y\cos^2y=1-\cos^2y$
$\left(4a^{x+2}-2\right)\left(16a^{2x+4}+8a^{x+2}+4\right)$
$\left(-17\right)\cdot\left(-6\right)$
$\int2xe^{7x^2}dx$
$\left(\frac{3}{7}a-9b\right)\left(\frac{7}{2}a+6b\right)$
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