$\int_0^2\left(\frac{1}{\left(x^2+4\right)^2}\right)dx$
$z^4+4z^2w^2+4w^4$
$sec3y=-1$
$\left(-42\right).\left(+0\right)$
$\cot\left(30\right)^2$
$\frac{x+2}{x+1}<3$
$2y^2-5y^2+7;\:y=2$
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