$\lim_{x\to0}\left(\frac{e^{a\sqrt{x}}-1}{\sqrt{senbx}}\right)$
$\cos^2x+2\sin x+2=0$
$4x^3-x^2+5x-3-\left(x-7\right)$
$k^2-16k+63$
$x^3y^5\cdot x^2y$
$\left(5n-7m\right)^3$
$\int\sqrt[3]{x^4}+3\left(x^3\right)dx$
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