中4數學,唔該,列步驟

👨🏻‍🏫 學術台數學

2008-02-25 5:52 am

sinA-cosA=0,其中90<270
3cosA+4sinA=0,其中270<360

回答 (1)

2008-02-25 6:09 am

✔ 最佳答案

sinA - cosA = 0
sinA = cosA
tanA = 1
A = 225

3cosA + 4sinA = 0
cosA = -4sinA/3
tanA = -3/4
A = 323.1

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