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30 January, 19:39

Prove the identity. show all work. tan (x-pi/4) = tanx-1/tanx+1

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  1. 30 January, 21:46
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    Tan (A - B) = (tan A - tan B) / (1 + tan A tan B)

    tan (x - pi/4) = (tan x - tan pi/4) / (1 + tan x tan pi/4) = tan x - 1 / tan x + 1
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