1.

Equation of the common tangents of (x^(2))/( y^(2)) +- (y^(2))/( b^(2)) =1 ,( x^(2))/( b^(2)) +- (y^(2))/( a^(2)) =+- 1 are

Answer»

` y=+- X+- SQRT( a^(2)-B^(2)) `
` y=+-x +- 2sqrt(a^(2) +b^(2)) `
` y=+- x+- sqrt(a^(2) +b^(2) ) `
` y= +- x+- 2 sqrt( a^(2)- b^(2))`

ANSWER :A


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