The hyperbolic function required by the postgraduate entrance examination syllabus is less likely to solve problems for us in numbers one and three. Students in Grade Two should pay attention to solving differential equations, mainly reducible differential equations. Just pay attention to the fill-in-the-blank questions on the count of one and three.

Numbers one and three also need to test the sum of infinite poles and power series of infinite poles, which is what numbers one must test. For the number three, we are concerned about the basic theory and judgment method of infinite pole convergence and divergence interpreted by Fang Hao, the math tutor of Haitian Postgraduate Entrance Examination.