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![[29] Prove that tan6° .tan42°. tan66°. tan78° =1 [ Trigonometry]](https://img5.yellowmega.com/849/606/366210778496069.jpg)
16/09/2021
Most important problem of Trigonometry ! https://youtu.be/rhokIyekzgU
https://youtu.be/rhokIyekzgU
[29] Prove that tan6° .tan42°. tan66°. tan78° =1 [ Trigonometry] MATHEMATICS
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