$\left(e^x+e^{-x}\right)dy=y^2dx$
$sin\left(\frac{9}{25}\right)^2+cos\left(x\right)^2=1$
$8a^2+12ab-2na$
$\left(3p^3q^4-2r^2s\right)^2$
$\left(-8\right).\left(-5\right)+\left(-8\right).6+9.\left(-8\right)+\left(-8\right)$
$-7ab+11ab-20ab+31ab$
$2^3-2^2$
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