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∑k=144cosk∘∑k=144sink∘−∑k=144sink∘∑k=144cosk∘= ?\dfrac{\displaystyle\sum_{k=1}^{44}\cos{k^{\circ}}}{\displaystyle\sum_{k=1}^{44}\sin{k^{\circ}}}-\dfrac{\displaystyle\sum_{k=1}^{44}\sin{k^{\circ}}}{\displaystyle\sum_{k=1}^{44}\cos{k^{\circ}}}=\ ?k=1∑44sink∘k=1∑44cosk∘−k=1∑44cosk∘k=1∑44sink∘= ?
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