$4x^2+2\left(4x\right)\left(1\right)+1^2$
$\frac{dy}{dt}=\frac{8e^{-t}}{3+y};\:y\left(0\right)=0.2$
$22\:.\:-21$
$3\sec^2+2\sqrt{3}-1=0$
$\left(2r^{-\frac{1}{2}}\right)^6$
$98=225-x$
$2x^2+16x=0$
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