conic-section

Question: The line $x\cos \alpha +y\sin \alpha =p$ will touch the parabola ${{y}^{2}}=4a(x+a)$ , if

1) $p\cos \alpha +a=0$

2) $p\cos \alpha -a=0$

3) $a\cos \alpha +p=0$

4) $a\cos \alpha -p=0$

Solution:

Explanation: No Explanation

Parabola

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