docs: update math API docs
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docs/api/math/matrix3/rotation-x.md
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docs/api/math/matrix3/rotation-x.md
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# Matrix3::RotationX
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```cpp
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static Matrix3 RotationX(float radians)
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```
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返回绕 X 轴旋转的 3x3 旋转矩阵。
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**参数:**
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- `radians` - 旋转角度(弧度)
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**返回:** `Matrix3` - 绕 X 轴旋转的矩阵
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**复杂度:** O(1)
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**示例:**
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```cpp
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Matrix3 rotX = Matrix3::RotationX(Math::Radians(90.0f));
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// 结果(绕 X 轴旋转 90 度):
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// [1 0 0]
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// [0 0 -1]
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// [0 1 0]
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```
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