$-3-\left(-2\right)-6$
$a^2-ab=a$
$0>2x^2+6x+3$
$6\sin\left(\frac{\pi}{10}\right)\cos\left(\frac{\pi}{10}\right)$
$\left(5a+2ab\right)^2$
$9x^2-6x-80$
$\cos\left(\frac{14\pi}{15}\right)\cos\left(\frac{23\pi}{30}\right)+\sin\left(\frac{14\pi}{15}\right)\sin\left(\frac{23\pi}{30}\right)$
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