Option 4 : 9°

⇒ tan3A = cot(8A - 9°)

Put A = 9°

⇒ tan3 × 9° = cot (8 × 9° - 9°)

⇒ tan27° = cot63°

⇒ tan27° = tan27° (Satisfied)

Hence option 4 is correct.

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