$$\(A B C\)$$ is a rhombus and $$\(O\)$$ is the origin. The diagonals of the rhombus intersect at $$\(P\)$$. $$\(\overrightarrow{O P}=2 \mathbf{m}\)$$ and $$\(\overrightarrow{A P}=\mathbf{n}\)$$. Find, in terms of $$\(\mathbf{m}\)$$ and $$\(\mathbf{n}\)$$, in its simplest form (i) $$\(\overrightarrow{O A}\)$$ OA = ............................................ (ii) $$\(\overrightarrow{O C}\)$$. OC = ............................................

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