# 13) Find points on the curve   at which the tangents are  (b) parallel to y-axis

Parallel to y-axis means the slope of the tangent is   , means the slope of normal is 0
We know that slope of the tangent at a given point on the given curve is given by
Given the equation of the curve is

Slope of normal =
From this we can say that y = 0
Now. when y = 0,
Hence, the coordinates are (3,0) and (-3,0)

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