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Derive an expression for the factor of safety against slope instability for an infinite slope at...

Derive an expression for the factor of safety against slope instability for an infinite slope at an angle ?? from horizontal, and with horizontal groundwater seepage emerging from the slope (and then running off). The soil has a total unit weight ?? and the strength is defined by ??′ and ??′. Assume drained conditions. Define the potential failure plane as being located a distance “??” from the slope surface measured vertically.

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