$\cos\left(2x\right)+\cos\left(4x\right)=0$
$2x^2+9x+18\ge12$
$8a^2-14a-15$
$\left(2-2x^2\right)^3$
$-7x-2$
$1+\left\{1-\left[-1-\left(-1\right)-1+1+\left(-1\right)\right]\right\}$
$\lim_{x\to\infty}\left(4\arctan\left(e^x\right)\right)$
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