$\frac{9^{4}b^{5}}{a^{3}b}$
$\lim_{x\to11}\left(\sqrt{4x+1}\right)$
$x2\:+x\:-\:42$
$2sin^2x-1=\:-sen\:x$
$y=\sqrt[3]{5x^2+4x-1}$
$\left(x-10\right)^2-\left(8x-1\right)^2$
$\left(-8\right)\left(-5\right)+\left(4\right)\left(-3\right)$
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