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b. 8log9 = 2^3log3^2 = 2/3 × 2log3 = 2a/3
= 3 · ²log 3
= 3a
⁸log 9 = 1/3 · ²log 9
= 1/3 · ²log 3²
= 2/3 · ²log 3
= 2/3 · a
= 2a/3