Let 𝜙 and 𝜓 be two linearly independent solutions of the ordinary differential equation

𝑦′′ + (2 − cos 𝑥) 𝑦 = 0, 𝑥 ∈ ℝ .

Let 𝛼, 𝛽 ∈ ℝ be such that 𝛼 < 𝛽, 𝜙(𝛼) = 𝜙(𝛽) = 0 and 𝜙(𝑥) ≠ 0 for all 𝑥 ∈ (𝛼, 𝛽).

Consider the following statements:

𝑃: 𝜙′ (𝛼)𝜙′ (𝛽) > 0.

𝑄: 𝜙(𝑥)𝜓(𝑥) ≠ 0 for all 𝑥 ∈ (𝛼, 𝛽).

Then