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# Pls help me

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The vectors $\mathbf{a},$ $\mathbf{b},$ and $\mathbf{c}$ satisfy $\|\mathbf{a}\| = \|\mathbf{b}\| = 1,$ $\|\mathbf{c}\| = 2,$ and $\mathbf{a} \times (\mathbf{a} \times \mathbf{c}) + \mathbf{b} = \mathbf{0}.$If $\theta$ is the angle between $\mathbf{a}$ and $\mathbf{c},$ then find all possible values of $\theta,$ in degrees.

Apr 25, 2021