$\int_{0}^{2\pi}-4x\sin\left(2x\right)dx$
$\int sin^22x.dx$
$\left|20\right|>\:\left|6\right|$
$\lim_{x\to\infty\:}\left(7+\frac{1}{x}\right)$
$25-+-22$
$4^2+9x+81$
$\left(-45\right).\left(+23\right)$
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