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The locus of the mid-point of the portion intercepted between the axes by the line x cos a + y sin a = p, where p is a constant, is

a
x2+y2=4p2
b
1x2+1y2=4p2
c
x2+y2=4p2
d
1x2+1y2=2p2

detailed solution

Correct option is B

The line xcos⁡α+ysin⁡α=p meets the coordinate axes at Aμcos⁡α,0 and B0,psin⁡α. Let (h, k) be the coordinates of the mid point of the portion AB intercepted between the axes by the line x cos a+ y sin od=p.Thenph=cos⁡α2,k=0+sin⁡α2⇒ cos⁡α=p2h,sin⁡α=p2k⇒ cos2⁡α+sin2⁡α=p24h2+p24k2⇒ p24h2+p24k2=1Hence, the locus of (h, k) isp24x2+p24y2=1 or, 1x2+1y2=tp2

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