$log\sqrt[5]{x^2-21x}=\frac{2}{5}$
$\sqrt{53}\cos\left(x-15\right)=-5$
$\left(4x^6+y^4\right)\left(3x^9+2y^7\right)$
$\sqrt[5]{a^{10}b^{15}c^{5}}$
$4x^2-b^2$
$cos\left(3x\right)dx+sen\left(2y\right)dy=0$
$\left[\:2\:-3\:-\:\left(2\:+8\right)\:-2+13\right]-4$
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