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並前往https://books.google.com.tw/books?id=KNyeBQAAQBAJ&pg=PA608&lpg=PA608&dq=sin+(90+%CE%B8)&source=bl&ots=CcfHbY02h2&sig=ACfU3U3MsaxYs-GbC-18HxsE3UNBvWzLmA&hl=zh-TW&sa=X&ved=2ahUKEwjXvquCycn2AhVJqZUCHU-eD94Q6AF6BQi3AhAD

Handbook of Research on Teaching and Learning in K-20 Education

... the formula weight(sin(90-Θ)) and the horizontal force of the weight with the formula weight(cos(90-Θ)), in which Θ represents the angle of incline (p.

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