Do lactus rectum is perpendicular to the line joining the vertex and focus in parabola

latusrectum is the line segment through the focus perpendicular to the axis, which has both end points on the parabola.

line joining the focus to its vertex is the axis of the parabola.

therefore latus rerctum is perpendicular to the line joining the focus and the vertex .

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evaluate    sin 15 cos 15

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