If the angle between the two lines repre...

If the angle between the two lines represented by `2x^2+5x y+3y^2+6x+7y+4=0` is `tan^(-1)(m),` then find the value of `mdot`

A

(a) `1/5`

B

(b) `1 `

C

(c) `7/5`

D

(d) `7`

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