How to find the unit step function of 74 for the first 2pi3

How to find the unit step function of 74 for the first 2pi/3 seconds and then switches off

Solution

For a unit step function of magnitue b starting at x = a is written as

f(x) = b.u(t - a) where u(t) denotes unitstep function

Therefore , if we want to write a pulse working from x = a to x = c we write it as

f(x) = b( u(t - a) - u(t - c) )

=> Required function would be f(x) = 74( u(t) - u( t - (2/3) ) )