$tg\left(-240^{\circ}\right)+sec\left(\frac{5\pi\:}{3}\right)$
$\left(a^{x-1}-6\right)\left(a^{x-1}-5\right)$
$-6x^2-x+1=0$
$12g-3g+7$
$\left(-4\right)\left(3x-5\right)$
$\frac{3yx^{13}}{15y^4}$
$\left(+5\right)\left(-2\right)\left(-5\right)\left(-7\right)$
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