# 正弦與餘弦

Trigonometric Ratios

In obtuse-angled triangles, the square on the side subtending the obtuse angle is greater than the (sum of the) squares on the sides containing the obtuse angle by twice the ...

 [語音講解：sine.mp3]

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Created: Mar 23, 2022
Last Revised: 7/21, 11/10