A) \[\sqrt{{{c}_{2}}-{{c}_{1}}}\]
B) \[{{c}_{2}}-{{c}_{1}}\]
C) \[0\]
D) \[{{c}_{1}}-{{c}_{2}}\]
E) none of these
Correct Answer: A
Solution :
The length of tangent from circle\[{{x}^{2}}+{{y}^{2}}+2gx+2fy+{{c}_{1}}=0\]to the circle \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+{{c}_{2}}=0\]is\[\sqrt{{{c}_{2}}-{{c}_{1}}}\].
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