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senx secx/tanx =1
senx secx = tanx
senx (1/cosx)= senx/cosx
cancelan cosx
senx = senx
---------------------------
c) secx+tanx= cosx/1-senx
= ( secx+tanx)( 1-senx) =cosx
→ secx-secx.senx+tanx-tanx.senx=cosx
→ (1/cosx)-(1/cosx).senx+tanx-(senx/cosx)senx= cosx
→ (1- (senx)^2)/cosx = cosx
→ 1-(senx)^2 = (COSX)^2
Deja clara la notación del literal b para poder colaborarte.