If \( \mathrm{A} \) and \( \mathrm{B} \) are two points whose coordinates are (at \( { }^{2} \),... VIDEO
If \( \mathrm{A} \) and \( \mathrm{B} \) are two points whose coordinates are (at \( { }^{2} \),
2at) and \( \left(\frac{\mathrm{a}}{\mathrm{t}^{2}}, \frac{2 \mathrm{a}}{\mathrm{t}}\right) \) respectively and \( \mathrm{C} \) is the point \( (a, 0) \). Show that \( \frac{1}{\mathrm{CA}}+\frac{1}{\mathrm{CB}} \) is independent of \( t \).
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