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Which of the following pair(s) of curves...

Which of the following pair(s) of curves is/are orthogonal? `y^2=4a x ; y=e^(-x/(2a))` `y^2=4a x ; x^2=4a ya t(0,0)` `x y=a^2; x^2-y^2=b^2` `y=a x ;x^2+y^2=c^2`

A

`y^2=4ax,y=e^(-x//2a)`

B

`y^2=4ax,x^2=4ay`

C

`xy=a^2,x^2-y^2=b^2`

D

`y=ax,x^2+y^2=c^2`

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The correct Answer is:
A, C, D
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