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Difreálaigh w.r.t. n
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Luacháil
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Roinn

9n^{1-1}
Is é díorthach ax^{n} ná nax^{n-1}.
9n^{0}
Dealaigh 1 ó 1.
9\times 1
Do théarma ar bith t ach amháin 0, t^{0}=1.
9
Do théarma ar bith t, t\times 1=t agus 1t=t.