$4\cdot1+4\cdot3$
$\frac{\left(a^3b\right)^{-2}}{a^4}$
$sin\left(x\right)=2sin\left(\frac{x}{2}\right)cos\left(\frac{x}{2}\right)$
$\left(1-2n\right)^2$
$-20\cdot180+180$
$\left(i^2-2i+1\right)+\left(i^3+3i^2+3i+1\right)$
$2x^{-3}\cdot2x$
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