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posted by denise on Sunday, July 15, 2012 at 2:51pm.

sin t/(1-cos t)- 1 + cos t /sin t = 0

Maybe you mean: sin t (1+cos t)/[1-cos^2 t) - (1 + cos t)/sin t = 0 (1+cos t)/sin t - (1 + cos t)/sin t which is indeed zero

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