SOLUTION: I need help on trig identities.
Verify the following equation:
cosx(cosx-secx)=-sin^2x
So far I used the foil method to get cos^2x-cosxsecx but I'm not sure if that is right
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Question 689562: I need help on trig identities.
Verify the following equation:
cosx(cosx-secx)=-sin^2x
So far I used the foil method to get cos^2x-cosxsecx but I'm not sure if that is right
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
Verify the following equation:
cosx(cosx-secx)=-sin^2x
start with left side
cosx(cosx-secx)
=cosx(cosx-1/cosx)
=cos^2x-1
=-(1-cos^2x)
=-sin^2x
verified:
left side=right side
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