OpenStudy (anonymous):

proof: (1+tanx) / (1+cotx) = tan x

5 years ago
sam (.sam.):

(1+tanx)/(1+cotx)=tanx (1+(sinx)/(cosx))/(1+(cosx)/(sinx)) ((cosx+sinx)/(cosx))/(1+(cosx)/(sinx)) ((cosx+sinx)/(cosx))/((sinx+cosx)/(sinx)) (sinx)/(sinx+cosx)*(cosx+sinx)/(cosx) sinx*(1)/(cosx) (sinx)/(cosx) tanx

5 years ago
sam (.sam.):

QED

5 years ago
sam (.sam.):

If you don't understand just ask :)

5 years ago