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textbook: ces
title: 选词成段（1）
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## 题干

三角函数与 1.（ ）图形密切相关，尤其在直角三角形中。如果 2.（ ）一个锐角和一条边，即可运用 3.（ ）函数求出其他的未知量。

## 选项


- A. 几何

- B. 余弦

- C. 已知

- D. 斜边

- E. 计算