If the normal drawn from the origin to t...

If the normal drawn from the origin to the straight line `2x+7y+6=0` makes an angle `theta` with the postitive X-axis, then `theta`=

`tan^(-1)""(7)/(2)`

`pi-tan^(-1)""(7)/(2)`

`pi+tan^(-1)""(7)/(2)`

`-tan^(-1)""(7)/(2)`

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