question_answer

The equation of tangent to the circle \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}\] parallel to\[y=mx+c\]is                                                [RPET 2001]

A)            \[y=mx\pm \sqrt{1+{{m}^{2}}}\]                                        

B)            \[y=mx\pm a\sqrt{1+{{m}^{2}}}\]

C)            \[x=my\pm a\sqrt{1+{{m}^{2}}}\]                                      

D)            None of these