If the straight line x cosα + y sinα = p is tangent to the ellipse – McqOptions

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1.	If the straight line x cosα + y sinα = p is tangent to the ellipse \(\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1\). then
A.	\(p^2 = \frac{a^2b^2}{4}\)
B.	p2 = a2 cos2 α - b2 sin2 α
C.	p2 = a2 cos2 α + b2 sin2
D.	None of these
Answer» D. None of these

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