Question
एक वक्र को निम्नलिखित प्राचलिक समीकरणों (parametric equations) द्वारा निरूपित किया जाता है :
बिन्दु पर इस वक्र पर एकक स्पर्शी सदिश ज्ञात करें।
Answer :
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वक्र के प्राचलिक समीकरण हैं: [ x = 2\cos t, \quad y = 2\sin t, \quad z = \cos(3t) ] एकक स्पर्शी सदिश (\mathbf{T}) ज्ञात करने के लिए पहले हम (\mathbf{r}'(t)) निकालते हैं: [ \mathbf{r}'(t) = \frac{d\mathbf{r}}{dt} = \left(\frac{dx}{dt}, \frac{dy}{dt}, \frac{dz}{dt}\right) = (-2\sin t, 2\cos t, -3\sin(3t)) ] बिंदु (t = \frac{\pi}{2}) पर: [ \frac{dx}{dt}
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