find the value of sin 90 degrees（関連順）

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In the given figure, if ∠𝑨𝑩𝑪=〖𝟗𝟎〗^𝟎, find the values of 𝒔𝒊𝒏 𝜽 and 𝒄𝒐𝒔 𝜶#trigonometry

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結果 : find the value of sin 90 degrees