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---------------- = cscx -1
1- senx
cosx(cosx/senx)
------------------------ = cscx - 1
1 - senx
(cos²x /senx)
--------------------- = cscx -1
( 1 - senx )
cos²x
------------------- = cscx -1 como cos²x = 1 -sen²x remplazamos
senx(1-senx)
1 - sen²x
--------------------- = cscx -1
senx(1 -senx)
( 1 +senx)(1-senx)
---------------------------- = cscx -1
senx(1-senx)
1 +senx
-------------- = cscx -1
senx
1/senx +senx/senx = cscx -1
cecx +1 = cscx -1
no da identidad o mira si tienes mal colocado un signo
Resolviendo el termino de la izq.
cosx*(cosx/senx) / (1-senx)
=cos²x / [ senx(1-senx) ]
=(1-sen²x)/ [ senx(1-senx) ]
=[ (1+senx)(1-senx) ] / [ senx(1-senx) ]
=(1+senx) / senx
=1/senx + 1
=cscx + 1
se cumple la identidad.