2cos53°/sin37° + 13 = 2cos53°/sin(90° - 53°) + 13 =2cos53°/cos53° + 13 = 2 + 13 = 15
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2cos53°/sin37° + 13 = 2cos53°/sin(90° - 53°) + 13 =2cos53°/cos53° + 13 = 2 + 13 = 15