anonymous
  • anonymous
Which equation is not an identity? tan(–t) = –tan t tan t(csc t + cot t) = sec t + 1 sin tcot t = cos t cos2t − sin2t = –1
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
anonymous
  • anonymous
i feel like it is d but in like 50% sure
anonymous
  • anonymous

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UsukiDoll
  • UsukiDoll
thinking...
UsukiDoll
  • UsukiDoll
I've seen \[\cos^2t-\sin^2t \] before. I think it was one of the identities for cos2t
anonymous
  • anonymous
okay so d is right?
UsukiDoll
  • UsukiDoll
yeah... there's also another identity which is \[\large \cos^2t+\sin^2t=1 \] but rearranging them a bit gives me \[\large \cos^2t=1-\sin^2t \] \[\large \sin^2t=1-\cos^2t \]
anonymous
  • anonymous
d was right lol this stuff is so confusing
UsukiDoll
  • UsukiDoll
|dw:1438846787051:dw|
UsukiDoll
  • UsukiDoll
one big huge trig list........and parts of it exist beyond trig.
anonymous
  • anonymous
okay i posted another question do you think you could help me on that one as well?

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