$\cot\left(x\right)=\frac{15}{8}$
$\sqrt{36-6cos\left(x\right)^2}$
$x^{2}-3=2x^{2}-12$
$\frac{d}{dx}\left(y=cos\left(5e^{4x}\right)\right)$
$3x+6x-x$
$\left(2x^2-2x+3\right)\left(x^2+5x-7\right)$
$16-\left(-5\right)$
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