prove that cot+sin/cot-sin=1-cos+sec/1+cos-sec plz help?

🎓 學業台家課輔助

[匿名]

2016-08-18 10:45 am

更新1:

cot+sin/cot-sin=1-cos+sec/1+cos-sec

回答 (3)

用戶2053

2016-08-18 11:26 am

✔ 最佳答案

(cot + sin) / (cot - sin)
= (cos + sin²) / (cos - sin²)
= (cos - cos² + 1) / (cos + cos² - 1)
= (1 - cos + sec) / (1 + cos - sec)

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[匿名]

2016-08-18 2:44 pm

How about adding sufficient parentheses?

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[匿名]

2016-08-18 11:27 am

Not one of those trigonometric functions has an argument. Both sides of the equation are undefined.

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