$\left(2\right)-\:\left(-4\right)\:-\left(-1\right)$
$3^2+\left(-2\right)^2$
$47.02374-38.93200$
$\left(2x-2y^2\right)^4$
$\sin\left(x-20\right)=0.678$
$\left(m-x\:10\right)^2$
$2-\left(x-3\right)^2$
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