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Kimi Pārōnaki e ai ki y
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Tohaina

15y^{1-1}
Ko te pārōnaki o ax^{n} ko nax^{n-1}.
15y^{0}
Tango 1 mai i 1.
15\times 1
Mō tētahi kupu t mahue te 0, t^{0}=1.
15
Mō tētahi kupu t, t\times 1=t me 1t=t.