$3\cos^2x+cosx=0$
$10y+8=-6+9y$
$\left(x^3+\frac{1}{5}\right)\left(x^3-\frac{1}{5}\right)$
$v-10=-9$
$\left(7s+2t\right)\left(7s-2t\right)$
$2\cot\left(90\right)$
$3-\left(-\:17\right)+3-\left(-\:12\right)$
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