A) \[a{{\left( t+\frac{1}{t} \right)}^{2}}\]
B) \[a{{\left( t+\frac{2}{t} \right)}^{3}}\]
C) \[a{{\left( t+\frac{1}{t} \right)}^{3}}\]
D) None of these
Correct Answer: A
Solution :
If one en(! of a focal chord is \[(a{{t}^{2}},\,2at),\] then length of focal chord \[=a{{({{t}_{1}}-t)}^{2}}\]where \[{{t}_{1}}t=-1\] \[=a{{\left( -\frac{1}{t}-t \right)}^{2}}\] \[=a{{\left( t+\frac{1}{t} \right)}^{2}}\]
You need to login to perform this action.
You will be redirected in
3 sec
