$\int x^3\left(9+x^4\right)^6dx$
$\lim_{x\to0}\left(\sqrt[2]{x+\sqrt[2]{x}}\:-\sqrt[\left[2\right]]{x-\sqrt{x}}\right)$
$4.5+1.7$
$\cos\left(7.549\right)$
$\cos x\left(1+\sec x\right)\left(\cos x-1\right)=\sin^2x$
$\left(45\right)-\left(-4\right)$
$y-20:\left(-5\right)$
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