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please explain in detail. For the queation a, x is -pi/3, 2pi/3 but I don't know where the values come from and how to find

please explain in detail. For the queation a, x is -pi/3, 2pi/3 but I don't know where the values come from and how to find it. Tbanks

(a) Find all solutions for tan(a) = - V3. (b) If sin(a) = = and sec(y) = 7, where 0 S a , and 0

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