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From a point (sintheta,costheta), if th...

From a point `(sintheta,costheta),` if three normals can be drawn to the parobala `y^2=4a x ,` then the value of `a` is (a)`(1/2,1)` (b) `[-1/2,0]` `[1/2,1]` (d) `(-1/2,0)uu(0,1/2)`

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