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------------------ = --------------
sen³ x 1 + cosx
senx /cosx -senx secx
------------------------------- = ----------------
sen³ x 1 + cosx
(senx -cosxsenx)/cosx secx
--------------------------------- = ----------------
sen³ x 1 + cosx
(senx - cosxsenx) secx
------------------------- = ---------------
cosx sen³x 1 +cosx
senx( 1 -cosx) secx
------------------------ = ----------------
cosxsenx sen²x 1+cosx
(1 -cosx) secx
------------------ = ----------- por identidad sen²x = 1 -cos²x
cosx sen²x 1+cox
(1 - cosx) secx
------------------------ = -----------
(1 -cos²x) cosx 1+cox
(1 - cosx) secx
---------------------------------- = --------------
(1-cosx)( 1 +cosx)cosx (1 + cosx)
1 secx
------------------------- = ----------------
(1 +cosx ) cosx 1 +cosx
1 1 secx
------------ . -------- = ----------
1+cosx cosx 1+cosx
1 secx
-------------- . secx = -----------
1 +cosx 1 +cosx
secx secx
------------ = -----------
1 +cosx 1+ cosx
3). 1 -senx /cscx = cos²x
1 - senx/(1/senx) = cos²x
1 - sen²x = cos²x por identidad 1 - sen²x = cos²x
cos²x = cos²x
4) ( 1 +tanx)(1 -tanx) = 2 -sec²x
1-tan²x = 2 -sec²x por identidad tan²x = sec²x -1 remplazando
1-(sec²x -1) = 2-sec²x
1 -sec²x +1 = 2-sec²x
2-sec²x = 2-sec²x