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