Question

The active earth pressure of a soil is proportional to (where`varphi` is the angle of friction of the soil)



Options:
A .  tan (`45^circ`-`varphi`)
B .  tan2 (`45^circ`+ `varphi`/2)
C .  tan2 (`45^circ` + `varphi`/2)
D .  tan (`45^circ`+`varphi`)
Answer: Option C


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