$36-\left(4\cdot16+2\cdot1\cdot9\right)$
$8cot^2x+12cot\:x-8$
$\left(6a+2b^2\right)\left(6a^4-2b^2\right)$
$\frac{x^2+15-5}{-x+3}$
$\ln\left(x\left(x-4\right)\right)$
$\sqrt{75x}-\sqrt{12x}$
$5^{x+1}=25$
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