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ZX-FDED47F8EARight triangles and trigonometry · 第 15 题
Right triangles and trigonometry · 原库模块 1 · Q15 原库参考解析
Triangle ABC is similar to triangle DEF, where angle A corresponds to angle D and angles C and F are right angles. The length of \( AB \) is 2.9 times the length of \( DE \) . If tanA = \( \frac{21}{20} \) , what is the value of sinD?
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