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Mathematics subject college entrance examination 20 14 Jiangsu
Question 13 (0, 1/2) Drawing

14? With sine theorem? A+ group 2b=2c

COSC = (A 2+B 2-C 2)/2AB? C is replaced by a+ group 2b=2c.

Get a formula? Use? Average inequality? You can get the answer. (Square root of 6-2) /4

Reading 20 questions.

The third question is my analysis:

Any given arithmetic series AB has a solution.