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Mathematics 10 Online
OpenStudy (anonymous):

A woman stands at a horizontal distance "x" from a mountain and measures the angel of elevation of the mountaintop above the horizontal as "Θ." After walking a distance "d" closer to the mountain on ground level, she finds the angel to be "Φ." Find a general equation for the height "y" of the mountain in terms of "d", "Φ", and "Θ." Neglecting the height of her eyes above ground level.

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