Word Count : 250

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सिद्ध करने के लिए हमें यह दिखाना है कि अगर \(\vec{u}\) एक अचर सदिश है, तो \(\vec{\nabla} \times (\vec{u} \times \vec{r}) = 2 \vec{u}\)। यहां, \(\vec{u}\) एक अचर (constant) सदिश है, और \(\vec{r}\) स्थान का सदिश है। हमारे पास \(\vec{u} \times ___ _______ __________ _____ ________ ________ ____ _________.
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