$\lim_{x\to0}\left(\frac{e^{2x}-2x-1}{x^3+2x^2}\right)$
$\sin\left(\frac{-\pi}{10}\right)\csc\left(\frac{21\pi}{10}\right)$
$\lim_{x\to3\pi}\cos\left(x\right)$
$a^2b^2+3a^2b-6a^2b^3+7a^2b^3$
$-2\cdot4+3$
$5a^2+b^2;\:a=2;\:b=3$
$x^2+3x<4$
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