Hello! ^^
1. ,
2. ,
Those solutions are for . If , then the solutions are .
Vaironxxrd
transfer the 2 to the left side and then substitute -2 with the basic trigonometric identity (cosx)^2+(sinx)^2=1 to find 2(cosx)^2+cosx=0
then factorise to get cosx[2cosx+1]=0..then solve it it is easy..try....it
MINOAS