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a)
senx( 1 + 1 )=tanx+1
cosx senx
senx + senx = tanx+1
cosx senx
tanx + 1 = tanx + 1
.........................................................
secz(cotz)(senz)=1
1 ( cosz)(senz)=1 cancelamos cosz y senz
cosz senz
1=1
.....................................
(tanx+cotx)senxcosx=1
(senx + cosx) senxcosx=1
(cosx senx)
senx . senxcosx + cosx . senxcosx =1
cosx senx
sen²x + cos²x = 1 identidad sen²x+cos²x=1
1 = 1