Could someone explain this trigonometry question for me?

Could someone explain this trigonometry question for me?
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1 Answer

Answer :

answer:So I’ll explain what I get. lets replace h:o and d:a tan= o/a but of course we don’t have the full length of a so by rearranging it to o=tanθ a isn’t the right answer so far. I don’t get why tanθ2 / tan θ2 -tanθ1 is there.
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