$e ^ { 1 } - e ^ { - 1 }$
$4x+6^2$
$2\left(x^2+4\right)-3\left(x^2-5\right)$
$-2\:\cdot\:5\:+\:2\:-\:7\:\cdot\:3\:$
$5y^4+25y^3-70y^2$
$10r\:+\:42\:=\:-38$
$\sqrt{-625}$
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