Wikipedia:Sandbox/Archive

${\mathrm {d} \over \mathrm {d} x}\int _{0}^{x}t^{3}\,\mathrm {d} t=f(x){\mathrm {d} x \over \mathrm {d} x}-f(0){\mathrm {d} 0 \over \mathrm {0} }=x^{3}.$

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This is not a Love Song

$1=2$ [1]