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Sin[40 Degree] + Sin[50 Degree] == 2 Sin[(40 Degree + 50 Degree)/2] Cos[(40 Degree - 50 Degree)/2]
Sin[40 Degree] + Sin[50 Degree] == 2 Sin[(40 Degree + 50 Degree)/2] Cos[(40 Degree - 50 Degree)/2]
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