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If m tan (theta -30^(@)) = n tan (theta ...

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))`

Text Solution

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The correct Answer is:
A
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