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posted by - on Tuesday, January 26, 2010 at 3:55pm.

solve (sq.rt 2) (tanx)(cosx) = tanx

sqrt2 cos x = 1 cosx = 1/sqrt2 x = 45 degrees and 315 degrees

tan x = 0 is also a solution. That leads to two more possible values of x. See if you can figure out what they are.

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