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A ladder 15 metres long just reaches the...

A ladder 15 metres long just reaches the top of a vertical wall. If the ladder makes an angle of `60^@` with the wall, find the height of the wall.

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AGRAWAL PUBLICATION-INTRODUCTION TO TRIGNOMETRY AND ITS APPLICATIONS-EXAMPLE
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  2. Prove that (sin theta + 1 + cos theta)(sin theta - 1 + cos theta).sec ...

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