If sin = 1/3, /2 < < , and cos = -1/3, < <
Question:
If sinα = 1/3, π/2 < α < π, and cosβ = -1/3, π < β < 3π/2, find the exact value of:
(a) cosα
(b) sinβ
(c) cos(2α)
(d) cos(α + β)
(e) sin β/2
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