Geometry Refer to the figure. If |OA| = 1, show that: (a) Area OAC = 1/2 sin
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Geometry Refer to the figure. If |OA| = 1, show that:
(a) Area ΔOAC = 1/2 sin α cos α
(b) Area ΔOCB = 1/2 |OB|2 sin β cos β
(c) Area ΔOAB = 1/2 |OB| sin(α + β)
(d) |OB| = cos α/cos β
(e) sin(α + β) = sin α cos β + cos α sin β
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C A D
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