Answer:
b) 
Step-by-step explanation:
We can use the discriminant
to determine how many real solutions a quadratic equation in the form
has.
- discriminant > 0 ⇒ 2 real solutions
- discriminant = 0 ⇒ 1 real solution
- discriminant < 0 ⇒ no real solutions








1/3 x^(-2/3) cos (x^1/3) + 1/3(sinx)^-2/3 .cos x