$3-\left|-4\right|-\left(-10\right)-\left|-15\right|$
$8x^2-36x^2+36x-27$
$16-16x-x^2$
$\sqrt{x-\frac{9}{x}}$
$18a^6+12a^3$
$\left(-21\right):\:\left(-7\right):\left(-1\right)$
$\tan\left(c\right)+\cot\left(c\right)=\sec\left(c\right)\cdot\csc\left(c\right)$
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