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OpenStudy (anonymous):
proof: (1+tanx) / (1+cotx) = tan x
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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
sam (.sam.):
QED
sam (.sam.):
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