The discussion revolves around the correctness of trigonometric identities involving cosine and sine functions, specifically in the context of angles expressed as 90 degrees plus a variable theta. Participants are seeking clarification on these identities.
The discussion is active, with participants expressing differing views on the correctness of the identities. Some have provided guidance on exploring standard trigonometric identities, while others are in the process of verifying their understanding.
There is an indication that participants are referencing specific trigonometric identities and may be working under the constraints of homework guidelines that require them to verify their solutions independently.
Refer to the unit circle and you can answer this yourself.rocophysics said:cos(90+theta) = sin(theta)
sin(90+theta) = -cos(theta)
thanks!
lol ah! why didn't it click, thanks again cristo :-]cristo said:No, they are not. Do you know an expression for cos(x+90) and sin(x+90), or more generally cos(a+b) and sin(a+b)?