What is the solution of the mentioned problem??

Question

$tan6@tan42@tan66@tan78@=?$

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Answer 1 · 2017-12-24T17:16:13

Image reference again....

![my http://notebook...](https://useruploads.socratic.org/r3nKAxOISVyKZcphRoK2_IMG_20171224_224210_770%5B1%5D.JPG)

For any further problem,as before,please notify me.

Hope it helps...
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