$-8d^2-3d^2$
$\left(-x+-a\right)^2$
$\lim_{x\to0}\left(\frac{\left(sin\left(3x\right)sin\left(5x\right)\right)}{1-cos\left(7x\right)}\right)$
$\sqrt[3]{9\cdot\:\sqrt[3]{9\cdot\:\sqrt[3]{9\cdot\:\sqrt[3]{9\cdot\:\sqrt[3]{9\cdot\:\sqrt[3]{27}}}}}}$
$-\:23\:+\:14\:+\:9\:-\:18\:-\:15\:+\:11\:-\:23\:-\:7\:+\:34\:$
$k=ctgx\cdot cosx\cdot senx$
$2x^2+4x-16=0$
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