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If b cos (theta+120^(@))=c cos (theta +2...

If b `cos (theta+120^(@))=c cos (theta +240^(@)),` then the value of `(b+c)/(b-c) tan theta` is-

A

`sqrt3`

B

`(1)/(sqrt3)`

C

`-(1)/(sqrt3)`

D

`-sqrt3`

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • If m tan (theta -30^(@)) = n tan (theta +120^(@)), then the value of cos 2 theta is -

    A
    `(m+n)/(2(m-n))`
    B
    `(m+n)/(m-n)`
    C
    `(m-n)/(m+n)`
    D
    `(2m-n)/(2(m+n))`

  • If a sin theta =b sin (120^(@) +theta) =c sin (240^(@) +theta), then the value of (ab+ bc+ ca) is-

    A
    1
    B
    2
    C
    `-1`
    D
    0

  • If tan2theta=cos(theta+15^(@)) then the value of theta is

    A
    `5^(@)`
    B
    `10^(@)`
    C
    `20^(@)`
    D
    `25^(@)`

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