$49x^2+70x+25+0$
$\ln\left(\frac{5}{9x^2y}\right)$
$\frac{12x^2}{4x}$
$sin^2t-sin\:t=0$
$\int\frac{a^2}{u^2+a^2}du$
$x\frac{dx}{dt}+4t=0$
$x^2-12x-31=0$
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