$4y^2+32xy$
$\frac{\tan\:\left(2x\right)}{2\sin\left(x\right)\cos\left(x\right)}=\frac{1}{\cos\left(2x\right)}$
$dx+\left(1-x^2\right)cot\:y\:dy\:=0$
$y^2-26y-56$
$x^2+4x=12$
$\int\frac{1}{\left(s^2+1\right)^2}ds$
$-111.28\cdot20$
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