The discussion revolves around double angle identities in trigonometry, specifically focusing on the correct formulations and interpretations of these identities.
The conversation is active, with participants engaging in a back-and-forth regarding the correctness of the double angle identities. There is no clear consensus, but the discussion is focused on clarifying misunderstandings and verifying the identities.
Some participants express uncertainty about the correctness of the identities and the signs used in the equations, indicating a need for further verification and discussion.
first off, your double-angle identities are wrongDouble Angle Identities are as follows:
sin2x = 2sinxcosx
cos2x = cos^2x - sin^2x
= 2sin^2x - 1
= 2cos^2x - 1
rocophysics said:first off, your double-angle identities are wrong
[tex]\cos{2x}=\cos^{2}x-\sin^{2}x[/tex]
[tex]\cos{2x}=2\cos^{2}x-1[/tex]
[tex]\cos{2x}=1-2\sin^{2}x[/tex]
your signs are off, i haven't checked your work thoughMacleef said:what are you talking about? they're exactly the same