Calculating the Constant of Integration in Parametric, Vector-based Equations

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I'm having trouble finding the constant of integration in parametric, vector-based equations.

Given an equation:

$$ a(t)\ =\langle \cos(t),\ \sin(t)\rangle $$

and

$$ \int\ a(t)\ dt\ =\langle 0,\ 2\rangle $$

for some $t$, I need to calculate the constant of integration for the $i$ and $j$ components of $a(t)$.

So, I can get as far as finding the following:

$$ \int a(t)\ dt\ =\langle \sin(t), -\cos(t)\rangle + \mathbf C $$ $$ C_i = -\sin(t) $$ $$ C_j = 2 + \cos(t) $$

My hunch is I need to resolve t to some number--otherwise $C$ isn't a constant.

Any nudges in the right direction would be most appreciated.