Solve this:
From the top of a 7 m high building, the angle of elevation of the top of a cable tower is and the angle of depression of the foot of the tower is . Find the height of the tower.
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https://www.meritnation.com/ask-answer/question/from-a-top-of-a-7m-high-building-the-angle-of-elevation-of-t/some-applications-of-trigonometry/678034
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https://www.meritnation.com/ask-answer/question/from-a-top-of-a-7m-high-building-the-angle-of-elevation-of-t/some-applications-of-trigonometry/678034
Regards