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Question

tanx+tan(x+π3)+tan(x+2π3)=3tan3x=

A
3
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B
2
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C
1
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D
0
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Solution

The correct option is D 1
tanx+tan[x+π3]+tan[x+2π3]=3
tanx+tanx+313tanx+tanx31+3tanx=3=3
tan(13tan2x)+(tanx+3)(1+3tanx)+(tanx3)(13tanx)13tan2x=3
[tanx3tan3x+tanx+3tan2x+3+3tanx+tanx3tan2x3+3tanx]13tan2x=3
9tanx3tan3x13tan2x=3
3tanxtan3x13tan2x=1
tan3x=1

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