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The angle of elevation of the top of a c...

The angle of elevation of the top of a certain tower from a point A on the ground is `alpha`, at B is `2alpha`, at C is `3alpha`. If `AB= 4/3 BC`, then which of the following is true.

A

`sinalpha=sqrt((5)/(12))`

B

`cosalpha=sqrt((5)/(12))`

C

`sinalpha=(3)/(4)`

D

`cosalpha=(3)/(8)`

Text Solution

Verified by Experts

The correct Answer is:
A
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