circle

Question: If the circle ${{x}^{2}}+{{y}^{2}}={{a}^{2}}$ cuts off a chord of length 2b from the line $y=mx+c$ , then

1) $(1-{{m}^{2}})({{a}^{2}}+{{b}^{2}})={{c}^{2}}$

2) $(1+{{m}^{2}})({{a}^{2}}-{{b}^{2}})={{c}^{2}}$

3) $(1-{{m}^{2}})({{a}^{2}}-{{b}^{2}})={{c}^{2}}$

4) None of these

Solution:

Explanation: No Explanation

Chord of contact of tangent Pole and Polar

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