Question
a.
\(σ_1=tan(45°+\frac{φ}{2})+σ_3 tan^2 (45°+\frac{φ}{2}) \)
b.
\(σ_1=2c+σ_3 tan^2 (45°+\frac{φ}{2})\)
c.
\(σ_1=2c \,tan(45°+\frac{φ}{2})+σ_3\)
d.
\(σ_1=2c \,tan(45°+\frac{φ}{2})+σ_3 tan^2 (45°+\frac{φ}{2})\)
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