$\sqrt{x^2-2}-\frac{x^2+3x}{x-1}$
$cota\:+\:\frac{1-2cos^2a}{sinacosa}$
$8x+2=6x+4$
$\left(-x\right)\left(3x^4\right)$
$cot\:x\:=\:-\frac{24}{7}$
$\frac{dy}{dx}=sec\left(6x\right)$
$-691-198$
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