更新1:
[(sin^2 22 degrees sin^2 68degrees/cos^2 22 degrees cos^2 68 degrees) +sin^2 63 degrees+cos 63 degrees sin 27degrees ] is
The value of the expression?
回答 (2)
2016-07-12 11:50 am
✔ 最佳答案
[sin²22° sin²68°/ cos²22° cos²68°] + sin²63° + cos63° sin27°= [sin²22° sin²68°/ cos²(90°-68°) cos²(90°-22°)] + sin²63° + cos63° sin(90°-63°)
= [sin²22° sin²68°/ sin²68° sin²22°] + (sin²63° + cos²63°)
= 1 + 1
= 2
2016-07-12 2:41 pm
[(sin^2 22° sin^2 68°/cos^2 22° cos^2 68°) +sin^2 63° +cos 63° sin 27° ]
收錄日期: 2021-04-20 16:26:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160712034007AAZcEJ8