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" 8."(sec A sec B+tan A tan B)^(2)-(sec ...

" 8."(sec A sec B+tan A tan B)^(2)-(sec A tan B+tan A sec B)^(2)=1

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Prove the following identity: (sec A sec B+tan A tan B)^(2)-(sec A tan B+tan A sec B)^(2)=1

(sec x sec y + tan x tan y) ^ (2) - (sec x tan y + tan x sec y) ^ (2) = 1 Prove it

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