Question

(cos^2)(x) - cosx + 6 = 0

Answer 1

Answer:

1or-1

Step-by-step explanation:

2cos^2x+cosx-6=0

=2cos²x+4cosx-3cosx-6=0

=2cosx(cosx+2)-3(cosx+2)=0

=(cosx+2)(2cosx-3)=0

either cosx=-2 or cosx=3/2=1.5

which is not possible as value of cosx ranges from -1 to 1

hence the given equation is not possible