Prove that(3)
回答 (2)
2007-04-01 8:47 am
✔ 最佳答案
L.H.S.= sin²(90° - X)= cos²X
= 1 - sin²X
= R.H.S.
2007-04-01 8:50 am
sin²(90º-x)
=[sin(90º-1)]²
=(cosx)²
=cos²x
=1-sin²x
=[sin(90º-1)]²
=(cosx)²
=cos²x
=1-sin²x
收錄日期: 2021-04-12 20:15:54
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