$3x^4+15x^2=\:0$
$x^2+4x=5$
$m^8+18m^4n^2+81n^4$
$\sec\left(a\right)=\tan\left(a\right)\cdot\csc\left(a\right)$
$\int\frac{4x\ln\left(5+x\right)}{3}dx$
$\lim_{x\to0}\left(12x+cosx\right)^{\frac{1}{x}}$
$y^2\:-\:121\:$
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