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\frac{\mathrm{d}}{\mathrm{d}r}(19r)
Pahekotia te 6r me 13r, ka 19r.
19r^{1-1}
Ko te pārōnaki o ax^{n} ko nax^{n-1}.
19r^{0}
Tango 1 mai i 1.
19\times 1
Mō tētahi kupu t mahue te 0, t^{0}=1.
19
Mō tētahi kupu t, t\times 1=t me 1t=t.
19r
Pahekotia te 6r me 13r, ka 19r.