1.

IF mtan( theta- 30^@) = n tan( theta+ 120 ^2 )thencos2 thetaequals

Answer»

`(m+n) /(m-n) `
`(m-n)/(m+n)`
`(m-n)/ (2 (m-n))`
`(m+n)/(2 (m-n))`

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