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The direction cosine n is given by formula _____

a) \(\frac{x_2-x_1}{l_e}\)
b) \(\frac{y_2-y_1}{l_e}\)
c) \(\frac{z_2-z_1}{l_e}\)
d) Undefined

Answer: c
Explanation: A truss is a two node element. The three D truss element can be treated as straight forward generalization of the 2D truss element.

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