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cosx cozy = (1/2) [cos (x - y) + cos (x + y)]
Sinx cozy = (1/2) [kasalanan (x + y) + kasalanan (x - y)]
cosx siny = (1/2) [kasalanan (x + y) - kasalanan [(x - y)]
Sinx siny = (1/2) [cos (x - y) - cos (x + y)]
Halimbawa, kapag u = 13 º, v = 17 º, kasalanan (13) kasalanan (17) = 0.065769, cos (13) cos (17) = 0.931795, kasalanan (13) cos (17) = 0.215122, cos (13 ) Sin (17) = 0.284878.
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