chalte chalte conics 3

from a point (sinÎ¸,cosÎ¸)if three normals are drawn to the parabola y²=4ax,then the value of a is:

a)(1/2,1)
b)[-1/2,0]
c)[1/2,1]
d)none

2 Answers

Three normals drawn from a point (h,k) to d parabola y²=4ax are real => h>2a...

From d above statement, sinÎ¸ > 2a => a Îµ [-1/2,1/2) ......

option (B) has to be correct... as it is a subset of d entire solution... :)

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