ahenley9898
ahenley9898
11-05-2017
Mathematics
contestada
Verify the identity secx-secx sin^2x=cosx
Respuesta :
ghanami
ghanami
11-05-2017
hello :
* secx = 1/cosx
cos²x+sin²x= 1
**sin²x = 1-cos²x
by (*) :
secx-secx sin²x=(1/cosx) -(1/cosx) sin²x
= (1/cosx)(1- sin²x)....factory :(1/cosx)
by(**)
secx-secx sin²x = (1/cosx)cos²x
secx-secx sin²x = cosx ...( simplify by : cosx)
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