Question: Prove that the following functions are cdfs. (a) +4tan-1 (z),ZE (-00,00) (c) e- , z (-o, 00) (e) the function defined in (1.5.6) (1+e-*)-I,ZE (-00,00)

Prove that the following functions are cdfs.

(a) +4tan-1 (z),ZE (-00,00) (c) e- , z (-o, 00) (e) the function defined in (1.5.6) (1+e-*)-I,ZE (-00,00) (b) (e) (b) (d) z E (-o0, oo) 1-e-z,-e (0,00)

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