Trigonometry Help Desparate
1. Find all the angles between 0 and 360 which satisfy the equation: cosineA+sin(3A)=cosine(2A)
2. Find the general solution of the equation sinA-sin(2A)=sin(4A)-sin(3A)
3. Find all the angles between 0-360 which satisfies the equation cosine(x)+7sin(x)=5
4. Find the value of theta less than 360 which satisfies the equation:
3cosine(theta)-4sin(theta)= 5
Thanks in advance ^^
March 11, 2012
6 Comments • Newest first
[quote=S14Enthusiast]1. Use sum formula and double angle formula CosA + Cos (2A+A) = Sin(2A)
2. Same as 1. Apply the sum formula and double angle
3. Use fundie identities and factor
4. Set the equation in terms of sin or cos and then factor
EDIT: 1. Use sum formula and double angle formula CosA + Cos (2A+A) = Cos(2A)[/quote]
I don't know to which term I should apply the identity to. ASDASFAJSD this is painful.
I'm actually taking calculus and trig separately. I think I'm supposed to actually learn these 2-3 years later, but I'm doing it now.
Calculus is easier than these trig...at least IMO
I haven't hardcore-tried it, tho. On and off... for 2 weeks.
@ProBlades:
I need to prove it with a good written solution. I'm not allowed to plug in for theta.
All you do is find theta for all these.
[quote=Fauntleroy]You should try to do your own homework![/quote]
I have tried for 2 weeks. Can't find a solution to them.
@lawlerskates:
Are you sure about that? So far I haven't seen anyone do that all in 1 minute.
1. The answer is 3 I think.
2. 275.
3. Again the answer is 3.
4. Maybe 120?