If cosa-sina=1 than prove that cosa+tana=+-1
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cos a- sina =1
and tana + cos a =+1
so tan a can be written as sina divided by cosa
then sina/cosa+cosa=1
sina/cosa=1-cosa
sina/cosa=sina
and then you further solve you get your answer
and tana + cos a =+1
so tan a can be written as sina divided by cosa
then sina/cosa+cosa=1
sina/cosa=1-cosa
sina/cosa=sina
and then you further solve you get your answer
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