Prove ,tan9?.tan21?.tan69?.tan81?=1
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https://www.meritnation.com/ask-answer/question/without-trigonometric-tableprove-thattan1-tan11-tan21-tan/introduction-to-trigonometry/8285395
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please find below the similar link
https://www.meritnation.com/ask-answer/question/without-trigonometric-tableprove-thattan1-tan11-tan21-tan/introduction-to-trigonometry/8285395
Regards