Equation of common tangent of \( y^{2}=4 a x \) and \( x^{2}=4 a y \) is
(A) \( x+y-a=0 \)
(B) \... VIDEO
Equation of common tangent of \( y^{2}=4 a x \) and \( x^{2}=4 a y \) is
(A) \( x+y-a=0 \)
(B) \( x-y-a=0 \)
\( \mathrm{P} \)
(C) \( x-y+a=0 \)
(D) \( x+y+a=0 \)
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