$cos\:=-\frac{4}{5}$
$-\left(-380-150-230\right)-\left(-1500-1200+2700\right)$
$-1\cdot5+4$
$2\cdot\left(-1\right)^{3}-4\left(\frac{1}{2}\right)+2$
$4x^2+32xy$
$1354-687$
$5x\left(n-1\right)+3y\left(n-1\right)$
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