Prove these identitys

sinO/1+cosO=1-cosO/sinO

1-tanO= -tanO(1-1/tanO)

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- November 26th 2008, 05:11 PMandrewpark2trig identitys
Prove these identitys

sinO/1+cosO=1-cosO/sinO

1-tanO= -tanO(1-1/tanO) - November 26th 2008, 05:26 PMskeeter
- November 26th 2008, 06:49 PMgreat_math