If `alpha` is the angle subtended at `P(x_(1),y_(1))` by the circle `S-=x^(2)+y^(2)+2gx+2fy+c=0` thenA. `cotalpha=(sqrtS_(1))/(sqrt((g^(2)+f^(2)-c)))`B. `cot""(alpha)/(2)=(sqrtS_(1))/(sqrt((g^(2)+f^(2)-c)))`C. `tanalpha=(2sqrt((g^(2)+f^(2)-c)))/(sqrtS_(1))`D. `alpha=2tan^(-1)((sqrt((g^(2)+f^(2)-c)))/(sqrtS_(1)))`

If `alpha` is the angle subtended at `P(x_(1),y_(1))` by the circle `S

1.	If `alpha` is the angle subtended at `P(x_(1),y_(1))` by the circle `S-=x^(2)+y^(2)+2gx+2fy+c=0` thenA. `cotalpha=(sqrtS_(1))/(sqrt((g^(2)+f^(2)-c)))`B. `cot""(alpha)/(2)=(sqrtS_(1))/(sqrt((g^(2)+f^(2)-c)))`C. `tanalpha=(2sqrt((g^(2)+f^(2)-c)))/(sqrtS_(1))`D. `alpha=2tan^(-1)((sqrt((g^(2)+f^(2)-c)))/(sqrtS_(1)))`
Answer» Correct Answer - B::D

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