$xsen\left(y\right)dx\left(x^2+1\right)cos\left(y\right)dy=0$
$\left(4x^2+3y\right)^4$
$9+8w+5w$
$f\left(x\right)\:=\:x^4-2x^2\:$
$x^4-2x^3+x^2+x-1$
$\left|\left(2abc^3+1\right)-8\right|^2$
$2x^2+4x-2.5=0$
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