$18-2x>4$
$3.6-9$
$-8\left(-4x\right)+-8\left(-6\right)$
$\frac{cos}{sec}$
$3\sin^2\left(x\right)-3=0$
$\frac{4x^2}{2x^3}$
$+26\:por\:\left(-9\right)$
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