The three-bar truss ABC shown in the figure has a span L = 3 m and is constructed of steel pipes having cross-sectional area A = 3900 mm2 and modulus of elasticity E = 200 GPa. Identical loads P act both vertically and horizontally at joint C, as shown.
(a) If P = 650 kN, what is the horizontal displacement of joint B?
(b) What is the maximum permissible load value Pmax if the displacement of joint B is limited to 1.5 mm?

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