1.

If sin thetaand - cos thetaare the roots of the equation ax^2-bx-c=0 where a, b and c the side of a triangle ABC , then cos B is equal to :-

Answer»

`1-(C )/(2A)`
`1-(c )/(a)`
`1+( c)/(2a)`
`1+ (c )/(3A)`

ANSWER :C


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