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If the conics whose equations are S-=sin...

If the conics whose equations are `S-=sin^2thetax^2+2h x y+cos^2thetay^2+32 x+16 y+19=0,S^(prime)-=cos^2thetax^2+2h^(prime)x y+s in^2thetay^2+16 x+32y+19=0` intersect at four concyclic points, then, (where `theta in R)` `h+h^(prime)=0` (b) `h=h '` `h+h^(prime)=1` (d) none of these

A

`h+h'=0`

B

`h= h'`

C

`h+h'=1`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
1
The curve passing through the point of intersection of S and S is
`S+ lambda S' =0`
or `x^(2)(sin^(2)theta+lambdacos^(2)theta)+y^(2)(cos^(2) theta+lambdasin^(2)theta)+2xy(h+lambdah')+x(32+16lambda)+y(16+32lambda)+19(1+lambda)=0`
For this equation to be a circle.
`sin^(2)theta+lambda cos^(2)theta=cos^(2)theta+lambdasin^(2)theta` or `lambda=1`
and `h+lambdah' =0` or `h +h'=0`
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