trig

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from an observer tower, a ff.above the level of a river,the angle of depression of a point on the near shore is theta and that of a point directly beyond on the far shore is FI. show that the width of the river is a (cotan theta=p+q/r)

  • trig -

    I cannot decipher your problem.
    Where do p, q, and r come from?
    what is ff and FI ?

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