$sin\left(5x\right)sin\left(4x\right)$
$-8-2+4r-2-9r+9-2$
$\lim_{x\to0}\left(\frac{x^2}{e^{2x}}\right)$
$-4x<18$
$x^2-8x+21$
$\left(3a^2b+2b^2\right)^3$
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