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Questions  

tan2π5tanπ153tan2π5tanπ15 is equal to

a
-3
b
1/3
c
1
d
3

detailed solution

Correct option is D

We have,        tan⁡6π15−tan⁡π151+tan⁡6π15tan⁡π15=tan⁡π3=   tan⁡6π15−tan⁡π15=3+3tan⁡6π15tan⁡π15=    tan⁡6π15−tan⁡π15−3tan⁡6π15tan⁡π15=3

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