Help I have spent about 3 days on this one, where I get lost is with the final part of the question
Use standard identities to express sin(3theta+(sqrt/4) in terms of sin theta and cos theta.
My tutor has explained it, but in terms of asuming that I know all the steps that he missed (a bit like here is a matrix, here is the determinate and missing the bits between)
Thanks
Thanks Mr. Fantastic. This is about where I got to
[quote] Use standard identities to express sin(3θ+(π/4) in terms of sin θ and cos θ
as best as I get
sin(3θ+(π/4))
sin(A+B)=sinAcosB+cosAsinB
the answer that I was given by a colleague
Ans = ((2sin θ cos θ)cos θ)+(sin θ(1-2 sin θ)) cos π/4 + sin π/4 ((1-2 sin θ) cos θ) - ((2 sin θ cos θ) sin θ
so here is where my problem is.
I end up with sin(3θ)cos(π/4)+cos(3θ)sin(π/4)
I need to know that if I am wrong, why and if he is right, how did he get there from where I am or am I just completely on the wrong path