- #1
diredragon
- 323
- 15
Homework Statement
cos(x - 3p/2) = - 4/5
p <x< p/2
sin(x/2)*cos(5p/4)= ?
Homework Equations
The Attempt at a Solution
I made it as far as to determine that sinx= 4/5 and cosx = - 3/5 but can't seems to progress any further. I am looking for an easier way to find the solution without having to deal with halfangle roots and all of that. Any hints?