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The angle of elevation of the top of a tower at a point on the ground is `30o` . What will be the angle of elevation, if the height of the tower is tripled?

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RD SHARMA-SOME APPLICATIONS OF TRIGONOMETRY-All Questions
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  15. Two persons are a metres apart and the height of one is double that...

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  16. A tower subtends an angle of 30o at a point on the same level as...

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