Seudónimo Seudónimo

21-03-2018
Mathematics

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I just need help with #21. I don’t know to figure it out. Please help. Thanks. :)

I just need help with 21 I dont know to figure it out Please help Thanks class=

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Аноним Аноним

21-03-2018

1 and 3 are angles of depression
2 and 4 are angles of elevation.

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