$\lim_{x\to1}\left(\frac{x+9}{x+4}\right)^2$
$\left(-2\right)\cdot\left[\left(-6+5\right)\cdot\left(-3\right)+\frac{\left(-36\right)}{6}\right]^4+1$
$\lim_{x\to\infty}\left(\frac{5x+9}{6x^2+3x-9}\right)$
$x^2-6=x$
$\left(\frac{x}{3}-\frac{y^2}{2}\right)\left(\frac{x}{3}-\frac{y^2}{2}\right)\left(\frac{x}{3}-\frac{y^2}{2}\right)$
$sen2x\cdot cot2x+sen2x=1$
$\cos\left(x\right)\left(\sin^2\left(x\right)+2\right)=0$
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