cos3x+cosx-cos2x=0 (i.e.zero) Find the general solution for x in
Answers
Answered by
5
Answer:
cos3x+cosx-cos2x=0
formula cosA +cosB = 2 cos (A+B/2)cos (A-B)
2 cos (3x+x/2)cos(3x-x) -cos2x =0
2cos2x cosx -cos2x =0
cos2x (2cos-1)=0
cos2x =0 cosx=1/2=pie/6
2x=(2n+1)pie/2 x=2npie +pie/6
x=(2n+1)pie/4 x=2npie -pie /6
Similar questions