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Sides of triangle ABC, a, b, c are in G....

Sides of triangle ABC, a, b, c are in G.P. If 'r' be the common ratio of this G.P. , then

A

`1 lt r lt 2 cos 36^(@)`

B

`2 sin 18^(@) lt r lt 1`

C

`r^(2)+r^(-2)=4`

D

none of these

Text Solution

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The correct Answer is:
A, B
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