Tan15tan20tan70tan75
![tan15tan20tan70tan75 = 1 tan15tan20tan70tan75 = 1](https://tex.z-dn.net/?f=tan15tan20tan70tan75+%3D+1)
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2
Answer:
please refer to attachment
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![](https://hi-static.z-dn.net/files/d96/e37902dfb800e6f4899cf7ff91e0ff73.jpg)
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0
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1
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