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(1+tanx)/(1-tanx)=(1+cotx)/(1-cotx)
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Explanation & Answer
(1+tanx)/(1-tanx)=(1+sinx/cosx)/(1-sinx/cosx)
= ((cosx+sinx)/cosx))/((cosx-sinx)/cosx))
= (cosx+sinx)/(cosx-sinx)
We divide up and down by sinx to make cotx appear
= (cotx+1)/(cotx-1)
This is the right expression
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