$\:\frac{m^4}{121}-\frac{n^6}{169}$
$\cos\left(3x\right)\cos\left(x\right)=-\sin\left(3x\right)\sin\left(x\right)$
$\left(x^{2}+5x+7\right):\left(2+x\right)$
$-33\left(-21\right)$
$3\left(-1^3\right)$
$\left|2\right|+\left|7\right|$
$\int\frac{-5t}{t^2+4}dt$
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