$684+-166$
$\left(7a+b\right)^2$
$3x+1=2x+3$
$\int\frac{x+1}{\left(x^3+x^2-6x\right)^2}dx$
$4\left(5+8y\right)$
$\frac{d}{dt}\sqrt{1+t^2}cos^4t$
$x'+4x=4t$
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