- #1
MacLaddy
Gold Member
- 291
- 11
Homework Statement
4sin3(x)=5sin(x)
In the interval [0,2╥)
Homework Equations
Lot's and lot's of trig identities.
The Attempt at a Solution
4sin3(x)=5sin(x)
4sin3(x)-5sin(x)=0
sinx(4sin2(x)-5)=0
Setting sin(x)=0 gives me the solutions of 0, and ╥, but trying the other part
4sin2(x)-5=0
sin2(x)=5/4
sin(x)=√5/2
This answer does not work at all for this solution, as my calculator just gives me constant errors when trying to find the inverse. I'm sure I'm going wrong somewhere on this.
Any help is appreciated.