Cosine Rule
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\(ABCD\) is a parallelogram in which the length of \(AB\) and \(AD\) are 2 cm and 1 cm respectively and \(\angle ABC = 60^\circ\), also the diagonals cut at \(P\) and \(\angle APB = \theta^\circ\).
Calculate the \(\textbf{exact}\) values of
i) \(AC\)
ii) \(BD\)
iii) \(\cos \theta\)
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