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" If alpha=(2 pi)/(7) ,then the value of...

" If `alpha=(2 pi)/(7)` ,then the value of `tan alpha tan2 alpha+tan2 alpha tan4 alpha+tan4 alpha tan alpha` is "

A

`-5`

B

`-3`

C

`-1`

D

`-7`

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The correct Answer is:
D
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ML KHANNA-TRIGONOMETRY RATIOS AND IDENTITIES-PROBLEM SET (6) ( MULTIPLE CHOICE QUESTIONS)
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  11. If x+y+z =pi //2, then cot x +cot y +cot z=

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