If the circle \( x^{2}+y^{2}=9 \) touches the circle \( x^{2}+y^{2}+6 y+c=0 \) then \( c \) is e...
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If the circle \( x^{2}+y^{2}=9 \) touches the circle \( x^{2}+y^{2}+6 y+c=0 \) then \( c \) is equal to
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