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If the tangent to the ellipse x^2 +4y^2=...

If the tangent to the ellipse `x^2 +4y^2=16` at the point 0 sanormal to the circle `x^2 +y^2-8x-4y=0` then `theta` is equal to

A

`(pi)/(2)`

B

`(pi)/(4)`

C

`(5pi)/(2)`

D

`(7pi)/(4)`

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The correct Answer is:
A
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