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If cos (A + 2B) = 0, 0^@ le (A + 2B) le ...

If `cos (A + 2B) = 0, 0^@ le (A + 2B) le 90^@` and `cos (B - A) = frac{sqrt 3}{2}`,` 0^@ le (B- A) le 90^@`, then find cosec (2A + B). Show your work.

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