Posted by leanne on Friday, July 30, 2010 at 11:31pm.
1-tan^2x=0
tan^2 x = 1
tan x = ±1
x = π/4, π - π/4, π + π/4, or 2π - π/4
x π/4, 3π/4, 5π/4, 7π/4
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