$a^2+12a\:+\:25$
$\csc^2\left(u\right)+\sec^2\left(u\right)$
$\frac{45}{28}a^4b^6.\frac{7}{3}ab^3.\frac{4}{5}a^5b$
$f^2+3f+4$
$4-8-20+5$
$\cos\left(x\right)-\sin\left(x\right)=-\frac{\sqrt{3}}{2}$
$\left(m^2+\:16m\:+\:64\right)\:cm^2$
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