when the x>0,then the theta is equal to 1(adsbygoogle = window.adsbygoogle || []).push({});

So the theta =0 when x=0

in the second term of the integral,

it starts to integrate the function from "0 "to infinity(see the yellow loop inside)

Since the" 0 "should not be included ,otherwise theta(0)=0 and (0*df/dt)=0

but why the 0 is still included in the integral to integrate the integrand!??

Sorry

i got confused

can anyone help me

thank you!??

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# I What happens in this step function?

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