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1995年全国高考理工数学第(22)题:求sin~220°+cos~250°+sin20°cos50°的值.在必修教材中有明显背景,是由代数上册第193页例4:“求sin~210°+cos~240°+s1n10°cos40°的值”改换两个数据得到,并且这两道题的答案都是3/4.
1995 National College Entrance Examination for Polytechnic Mathematics (22) Question: Find the value of sin~220°+cos~250°+sin20°cos50°. There are obvious backgrounds in the compulsory teaching materials. It is on the basis of algebraic volumes. Page 193 Example 4: The value of sin~210°+cos~240°+s1n10°cos40° is obtained by changing two data, and the answer to both questions is 3/4.