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1 ^{β (1 - δ}) = E ⅛β

1 + β - 2βδ       1 + β -

„1 ^{(1 - δ}) ^{(1 +} β ^{- 2}β^δ) ^- β ^{(1 - δ}) ^{(1 - 2δ})
E ^1—0

■ 1 + β — 2βδ — δ — βδ + 2βδ⁷ — β + 2βδ + βδ — 2βδ⁷
Ej 1 — δ --------------------------------------------------------------------------------------------

(1 + β — 2 ••■■■ ²

ι 1 — δ

E I—⁰ -----------------

(1+ β — 2βδ)2

and then:

E  —β — β² + 2β²δ + 2β² — 2β²δ + Eʌ        β        _{l σ} E

(1 + β — 2βδ)^{2       +}     (1 — δ)(1 + β — 2βδ)^lθg

1

E 1⅛     ∣^ β (β — 1)   , β

1 + β — 2βδ [1 + β — 2βδ ⁺ 1 — δ

From (18) we have:

∂ρ = (α (ξ + η + θ) — ξ) η — αη (ξ + η + θ) =

^dα ^          (α (ξ + η + θ) — ξ)²         ^

αξη + αη² + αθη — ξη — αξη — αη² — αθη           ξη

^(a (^{ξ +} η ^{+ θ}) — ^ξ)2                  ^(a (^{ξ +} η ^{+ θ}) — ^ξ)²

and then:

∂ρ        -№п ∙ α                 α²η

^dθ   (α (ξ + η + θ) — ξ)²     (α (ξ + η + θ) — ξ)²

and also:

∂ρ —oq (α — 1)           αη (1 — α)

^{dξ   (a} (^{ξ +} η ^{+ θ}) — ^ξ)2   ^(a (^{ξ +} η ^{+ θ}) — ^ξ)²

and finally:

∂ρ      (α (ξ + η + θ) — ξ) α — αη ∙ α

^dη ~       (α (ξ + η + θ) — ξ)²      "^

α²ξ + α²η + α²θ — αξ — α²η     α [α (ξ + θ) — ξ]

^(a (^{ξ +} η ^{+ θ}) — ^ξ)2        ^(a (^{ξ +} η ^{+ θ}) — ^ξ)2

33

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