$\frac{1}{x^2}<100$
$\sen^{4}\theta=\frac{1-\cos^{2}\theta}{\csc^{2}\theta}$
$\left(6^2.6\:\:\right)^0$
$\left(18x-6\right)^{2\:}+\left(6x-2\right)^2$
$cosx\:=\:-1$
$\left(5x^2\right)^3+9\left(5x^2\right)^2+3\cdot5x^2\left(-3\right)^2+\left(-3\right)^3$
$\frac{12x^2-6x+2}{3}$
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