1.

Find the values of `xa n dy`for which cosec `theta=(x^2-y^2)/(x^2+y^2)`is satisfied.

Answer» `x^2-y^2<=x^2+y^2`
`cosectheta>=1`
`cosectheta<=-1`
`(x^2-y^2)/(x^2+y^2)=1`
`x^2-y^2=a^2+y^2`
`y=0`
`(x^2-y^2)/(x^2+y^2)=-1`
`x^2-y^2=-(x^2+y^2)`
`x=0`.


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