$\left(7a^2b^3-cd^5\right)\left(7a^2b^3+cd^5\right)$
$\cos\left(x\right)=.4$
$\frac { 7 a } { a }$
$-98-63$
$\left(-+b\right)^2$
$-\frac{\infty}{-\infty}$
$\left(p-3c\right)\left(p+3c\right)$
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