How many of the following functions are **not** sinusoidal?

- \(f(x) = \dfrac{x}{\sin x}\)
- \(f(x) = \dfrac{\cos x}{\sin x}\)
- \(f(x) = \dfrac{\sin x}{\sec 180^\circ}\)

**Definition:** A **sinusoidal** function is continuous and periodic.

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