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20 13 Henan science mathematics examination paper
According to the situation of the provinces that use the national new curriculum standard test paper, it is likely to be a series, because the series of small questions can only test the nature or deduce the proof, so it is best to make a simple big question and investigate the knowledge points of proof, general term and sum. Trigonometric questions are too rigid, small questions can be done more difficult, and the degree of discrimination is good.