Hi, Can someone help guide me towards solving this question? This is what I've done so far: - otownsend
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try solving $\cos(60^\circ) = \dfrac 1 2 = \dfrac{v_1 \cdot v_2}{\|v_1\|\|v_2\|}$ where $v_1 = (1,1),~v_2 = \left(1,-\dfrac 1 k\right)$
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