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“对偶”是语文修辞学中的一种。“对偶”有正对、反对和串对等,正对指的是上下句意思上相似、相近、相补、相衬的对偶形式,如:墙上芦苇,头重脚轻根底浅;山间竹笋,嘴尖皮厚腹中空。反对指的是上下句意思上相反或相对的对偶形式,如:横眉冷对千夫指,俯首某为孺子牛。数学中通常运用的是正对和反对,若能把对偶思想运用于三角函数的求值中,常能起
“Duality ” is a kind of language rhetoric. “Opposite” There are oppositions, opposition and string equivalence, is the meaning of the sentence is similar to the upper and lower sentence similar, complementary, phase contrast dual forms, such as: reeds on the wall, top-heavy shallow; mountain bamboo shoots , Tip thick thick belly hollow. Opposition refers to the opposite sentence meaning or the opposite of the dual form, such as: horizontal frown on the fingers of the cold, bowed for a bullock cow. Commonly used in mathematics is the right and wrong, if the dual idea can be applied to the evaluation of trigonometric functions, often can play