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[(1-senx)/cosx](cosx/cosx)=cosx/(1+senx)
[(1-senx)(cosx)]/cos^2x=cosx/(1+senx)
[(1-senx)(cosx)]/(1-sen^2x)=cosx/(1+senx)
[(1-senx)(cosx)]/[(1-senx)(1+senx)]=cosx/(1+senx)
cosx/(1+senx)=cosx/(1+senx)