Posted by Craig on Wednesday, January 28, 2009 at 1:43pm.
Is cos2t supposed to represent cos^2 t or cos (2t)?
In either case, the expression is not a correct identity. I believe you copied the problem incorrectly. It should be
1-cos^2t divided by sin^2t = 1
In your second question, (tan x tan) t is not an accepted notation. Do you mean tan^2 t?
[1 - cos^2 t]/cos^2 t = sin^2 t/ cos^2 t
= tan^2 t
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