1.

The value of (1-tan^(2)15^(@))/(1+tan^(2)15^(@)) is

Answer»

`(m-1)/(m^(2)+1)`
`(2M)/(m^(2)+1)`
`(m^(2)-1)/(m^(2)+1)`
`(m+1)/(m^(2)+1)`

ANSWER :A


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