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Cos(A-B) = CosACosB + SinASinB
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Cos(A+B) = CosACosB - SinASinB
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Sin(A-B) = SinACosB - CosASinB
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Sin(A+B) = SinACosB + CosASinB
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x^2 + y^2 + 2gx + 2fy + c = 0
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