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诱导公式五（90°+α）

Author:桃篮翁

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判斷球體
找出對稱軸
兩位數除以一位數（二）
第八周作业
四邊形的特性

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Key stage 1
Area of triangle using 0.5bs sinA
中垂線性質
微积分-基础知识
ω的影响

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Statistics
Logic
Normal Distribution
Difference and Slope
Congruence

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