$tan\left(-t^2+1\right)=-tan\left(t^2-1\right)$
$z+7z+5z$
$30\:-\:20\::\:\left(5\:+\:15\right)$
$2\left(3c\right)\left(-b\right)$
$\left(3yz\right)\left(-4xy^3\right)\left(5x^3y^2z^2\right)$
$2w^2+2w-4$
$\int\sin3y\:dy$
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