Question

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求解QAQ
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DSE Assorted Exercises on Junior Secondary Topics
4.
In AABC, ZC = 90°. Which of the following must be true?
I. sin? A = cos B
tan A
II. tan C =
tan B
III. COS? C = cos? A + cos2 B
A.
I only
Chapter 12
B.
III only
C. I and III only
D. I, II and III

Answer 1

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pizza

如下圖
應該是A

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