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

If `m* tan ( theta - 30^(@))= n* tan( theta + 120^(@)), "then " cos 2 theta = `

A

`sin2theta`

B

`cos2theta`

C

`2sin2theta`

D

`2cos2theta`

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The correct Answer is:
D
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