If from any point on the circle x2+y2+2gx+2fy+c=0 tangents are drawn to the circle x2+y2+2gx+2fy+csin2α+(g2+f2)cos2α=0, then the angle between the tangents is
A
2α
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B
3α
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C
α
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D
None of these
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Solution
The correct option is A2α Clearly, the two circles are concentric.