(tan theta)/(1 - cot theta) + (cot theta)/(1 - tan theta) = 1 + sec theta*cosec theta

(tan theta)/(1 - cot theta) + (cot theta)/(1 - tan theta) = 1 + sec th

1.	(tan theta)/(1 - cot theta) + (cot theta)/(1 - tan theta) = 1 + sec theta*cosec theta
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