Botany-
General
Easy
Question
If the tangent at Point P to the ellipse 16x2 + 11y2 = 256 is also the tangent to the circle x2 + y2 - 2x = 15, then the eccentric angle of point P is
The correct answer is:
The equation of tangent at point to the ellipse
16x2 + 11y2 = 256 is
16x (4cosq) + 11y = 256
4xcosq + y sinq = 16
This touches the circle
(x + 1)2 + y2 = 16
So, = 4
Þ (cosq - 4)2 = 11 + 5cos2q
4cos2q + 8cosq - 5 = 0
\ cosq =
\ q = ±
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