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The solution of tanx+tan2x+tan3x=tanxtan2xtan3x is 

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a
x=nπ,n∈I
b
x=nπ2,n∈I
c
x=nπ3,n∈I
d
None of these
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detailed solution

Correct option is C

we know that,  tan⁡3x=tan⁡(x+2x)=tan⁡x+tan⁡2x1−tan⁡xtan⁡2x⇒    tan⁡3x−tan⁡xtan⁡2xtan⁡3x=tan⁡x+tan⁡2x⇒    tan⁡xtan⁡2xtan⁡3x=tan⁡3x−tan⁡x−tan⁡2x… (i)  Now,     tan⁡x+tan⁡2x+tan⁡3x=tan⁡xtan⁡2xtan⁡3x⇒    tan⁡x+tan⁡2x+tan⁡3x=tan⁡3x−tan⁡x−tan⁡2x⇒    [ from Eq. (i)] ⇒    2x=nπ+(−x)⇒3x=nπ⇒    x=nπ3, where n∈I


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