$\frac{1}{9}-4t\left(-\frac{5}{2}\right)-\left(-4\right)$
$6mn^2-3m^2$
$\sin a+\cos a=1$
$\int5x\:e^{-5x}dx$
$\int\frac{x+6}{x^2\left(x+1\right)}dx$
$\left(10x-9y\right)^2$
$\lim_{x\to0}\left(\frac{2a+x^2}{2a-x^2}\right)^{\frac{1}{x^2}}$
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