$6^{-4}\cdot6^4$
$\left(x+3\right)^{\frac{3}{2}}-\left(x+3\right)^{\frac{1}{2}}$
$x^2>2-x^2$
$5x\:-2\:por\:x=1$
$x\cdot\log\left(\sqrt{x+2}\right)$
$\left(\frac{8}{7}x\right)\left(\frac{7}{3}\right)$
$\frac{1-cos^2x}{sin\:x}=sin\:x$
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