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Question


The passive earth pressure of a soil, is proportional to (where`varphi` is the angle of internal friction of the soil.)



Options:
A .  tan (`45^circ` - `varphi`)
B .  tan (`45^circ`+ `varphi`)
C .  tan2 (`45^circ` -`varphi`)
D .  tan2 (`45^circ` + `varphi`)
Answer: Option D



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