$1+5+9+13\:$
$\frac{\left(\sin^4\:x-\cos\:^4x\right)}{\left(\cos^2\:\:x\right)}$
$\frac{\left(-180\right)}{12}$
$\left(x^6-49y^6\right)\:\:\left(x^3+7y^3\:\:\right)$
$\left(x-2\right)x-1$
$x^2+8x=c$
$sen\left(3x^2-2\right)$
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