sin52 = sin (0-38) = cos38 cos112 = cos (180-68) = - cos68. Торга sin68xsin38-sin52xcos112 = sin68sin38 + cos38cos68 = cos (68-38) = cos30 = (v3) / 2
sin52 = sin (0-38) = cos38 cos112 = cos (180-68) = - cos68. Торга sin68xsin38-sin52xcos112 = sin68sin38 + cos38cos68 = cos (68-38) = cos30 = (v3) / 2