Which of the following are NOT trigonometric identities? Check all that apply.

A. secx - cosx/secx = sin^2x
B. 1-tanx tany = cos(x+y)/cosxcosy
C. 4cosx sinx = 2cosx +1 -2sinx
D. tanx cosx cscx = 1

Question

Which of the following are NOT trigonometric identities? Check all that apply.

A. secx - cosx/secx = sin^2x
B. 1-tanx tany = cos(x+y)/cosxcosy
C. 4cosx sinx = 2cosx +1 -2sinx
D. tanx cosx cscx = 1

anonymous · Answer

@vinnv226 do you know this?

anonymous · Answer

It's been a long time since I've looked at trig identities to be honest. I think the best I can do is refer you to this page on wikipedia which does a good job of explaining all the trig identities: http://en.wikipedia.org/wiki/Trig_identities Again, sorry I can't be of more help here.

anonymous · Answer

@vinnv226 It's ok. I'll look at the link. @marissalovescats Do you know this?

loser66 · Answer

A and C are not identities

anonymous · Answer

ITS WRONG!!!! IT WAS JUST C!!! :( @Loser66

loser66 · Answer

ok, if you think so.