$3a+5a$
$\sin\left(x\right)=-\frac{\sqrt{31}}{7}$
$\left(7x^2+8y\right)\left(7x^2-8y\right)$
$12m^3-3n^2-4m^3+2n^2+9$
$x^2+16x-8$
$\lim\:_{x\to\:-3}\left(\frac{x^4-81}{x+3}\right)$
$3\ln\left(y\right)dy=xe^xdx$
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