cot9°×cot27°×cot45°× cot63°× cot81°× cot99°×cot117°× cot135°×cot 153°×cot171°
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Answer:
(cot 9*cot 81)(cot 27*cot 63)(cot 45)=(Cot 9*cot(90-9))(cot 27*cot(90-27))cot 45=(cot 9 *tan9)(cot 27*tan27)(cot 45)=cot 45=1
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ans............1....
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