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If alpha, beta and gamma are angle such ...

If `alpha, beta and gamma` are angle such that `tan alpha + tan beta+tan gamma= tan alpha tan beta tan gammaand x=cos alpha + I sin alpha, y=cos beta+ I sin beta and z= cos gamma+ I sin gamma,` then the value of xyz is -

A

1

B

`-1`

C

0

D

`1 or (-1)`

Text Solution

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The correct Answer is:
D
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CHHAYA PUBLICATION-MCQ's-QUESTION PAPER 9
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