A uniform long tube is bent into a circl...

A uniform long tube is bent into a circle of radius R and it lies in a vertical plane. Two liquids of same volume but densities `rho` and `delta` fill half the tube. The angle `theta` is

`tan^(-1)((rho-delta)/(rho-delta))`

`tan^(-1)rho//delta`

`tan^(-1)delta//rho`

`tan^(-1)""(rho+delta)/(rho-delta)`

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