The coefficient ka of the active earth pressure, is given by
Ka = \(\frac { 1 - tan } {1+tan } \)
Ka = \(\frac { 1+tan } { 1-tan }\)
ka = \(\frac { 1+sin } { 1-sin } \)
Ka = \(\frac { 1-sin } { 1+sin } \)
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Answer : Option D
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