$-134\left(-412\right)$
$5a^2-3a+2-8a^2-5a+7$
$\lim_{x\to0}\left(\frac{1}{x^2}\right)^x$
$-9-\left(-45\right)$
$cos2x\:+\:2\:cos\:x\:+\:1$
$-200-815$
$\sin3x-\sin x$
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