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a9=1296
a5=a1*q^4
a9=a1*q^8
a1*q^4=1
a1*q^8=1296
a1=1/q^4
1/q^4*q^8=1296
a1=1/q^4
q^4=1296
a1=1/1296 v a1=-1/1296
q=6 v q=-6
an=1/1296*6^(n-1)
an=6^-4*6^(n-1)
an=6^(n-5)
v
an=-1/1296*-6^(n-1)
an=6^-4*6^(n-1)
an=6^(n-5)