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**cr and lr circuits help.. exam in a bit and i'm stuck!!!**

okay so here's my question :

how is the peak voltage across the resistance (in a cr circuit) or the induction (in an rl circuit) = [tex]\pm[/tex]V[tex]_{m}[/tex]/(1-e[tex]^{-T/2\tau}[/tex])

V[tex]_{m}[/tex] is the max voltage of the pulse train.

the m denotes max

both circuits are in a steady state with a pulse response

if it were a positive step then v=V[tex]_{m}[/tex]e[tex]^{-T/\tau}[/tex]

and if it were a negative step it would be v=-V[tex]_{m}[/tex]e[tex]^{-T/\tau}[/tex]

so from this i can gather that the peak values will be a plus minus thing..

i can get to peak voltage = V[tex]_{m}[/tex]-v

but apart from that i'm very very lost... i've been working on this for a long while now but...

help please