$4m^2-16n^2$
$\int\frac{1}{\sqrt{-9x+4}}dx$
$-a^2b^2-a^2$
$\frac{1}{2}a-\frac{1}{4}b+\frac{1}{4}c-\frac{1}{4}a+\frac{1}{3}b+\frac{1}{2}c-a+b+c$
$36+12m^2+m^2^2$
$\cot^2v\sec^2v-\cot^2v$
$c=5cm,\:b=38^{\circ}$
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