How Do You Transform f(t) = cos(t) for t>=2 Using Step Functions?

[theextractor]

Homework Statement

just trying to get the below equation in terms of step functions, just not sure how to get the cos(t) with the same shifted variable
f(t) = 0 for t<2 f(t)=cos(t) t>=2

The Attempt at a Solution

this is what i got
cos(t)u(t-2)
just having troubles working out the shift for it, had no problems doing this sort of question when it was a multiple of pi, but this has stumped me!
thanks in advance

 

[MisterX]

You got it correct, cos(t)u(t-2).
When t = 2, then u(t-2) = u(0), which is where the unit step becomes 1.