Singularity functions puzzle

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ntetlow

Joined Jul 12, 2019
44
Can anyone please decipher the attached unit step functions? I am perplexed by some of the answers to questions set in fundamentals of electrical engineering, in particular the 'u(t-1) - 4t' in (a) and the use of t-u and t-u and u-t in (b). The final answers look OK but it's a mystery as to how they are arrived at. Thanks.

Neil Tetlow
 

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