$tan\left(cos^{-1}7x\right)$
$x^2+22x+2121$
$5y-x=13$
$2\left(3-y\right)+2x+7$
$192a^2b-300a^2bc^4$
$81^5=3^x$
$\int3t^2\left(2-\:3t^3\right)^2dt$
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