$9y^2+6yb+b^2$
$\lim_{x\to0}\left(\frac{3e^y+2e^{-x}}{x-5}\right)$
$x^2+10\cdot25$
$8y+21\ge2y-54$
$\frac{2}{3}\sin\left(-3x\right)$
$\frac{t}{\frac{t}{t}}$
$1-10a+25^2$
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