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# Pls help, I'm confused

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Let $$\theta$$ be an angle between $$\pi$$ and $$3\pi/2$$ such that $$\cos(\theta) = -1/9$$. Assume that $$\cos(\theta/2) < 0$$. Then if the terminal point of $$\theta/2$$ is $$(a_1,a_2)$$ then what is $$(a_1, a_2)$$ ?

Jan 18, 2022