1.

The transformed equation of x^(2) + y^(2) = r^(2) when the axes rotated through an angle 36^(@) is

Answer»

`SQRT(5) X^(2) - 4XY + 3Y^(2) = R^(2)`
`X^(2) + 2XY - sqrt(5) Y^(2) = r^(2)`
`X^(2) + Y^(2) = 2r^(2)`
`X^(2) + Y^(2) = r^(2)`

ANSWER :D


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