$2\left(x+3\left(x+3\right)\right)$
$\left(1-\sin^2\left(75\right)\right)\left(1+\tan^2\left(75\right)\right)=1$
$\left(4a^2-ab+2b^2\right)\left(2a-3b\right)$
$8.3-5.4$
$20y^4-15y^2$
$1-5-6$
$\lim_{x\to\infty}\left(\frac{3x+5}{3x-2}\right)^{6x-1}$
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