$5\left(5-\left(-4\right)\right)+5$
$sin\left(x+y\right)+sin\left(x-y\right)=2sin\left(x\right)\cdot cos\left(y\right)$
$\frac{4x^2}{x^2+9}$
$5+19\cdot2$
$\frac{2x+10}{2}$
$\left(m^3-4\right)\left(m^3+8\right)$
$3y+x-3\left(4+x\right)-5y+2$
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