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Proving Trigonometric identity: sin(2x) = 2sin(x)cos(x)
作者：
Apolinario "Sam" Ortega
主題：
餘弦
,
函數
,
正弦
Proving Trigonometric identity : sin(2x)=2sin(x)cos(x)
GeoGebra
Try moving the black sine wave graph. What do you see underneath?
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