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トピック:幾何

If a laser is triggered from the point (1,3) at 45 degrees counter clockwise, and it is reflected by a mirror located at the point (5,7), what angle must the mirror be rotated in order to reach its target at the point (1,9).

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Tangent Vector (2)

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Binomial Expansion (Negative Power)
Average of 3 numbers
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算数
内接円
行列
ベクトル (２次元)
立方体