Sinusoidals please

Geometry Level 3

How many of the following functions are not sinusoidal?

  • f(x)=xsinxf(x) = \dfrac{x}{\sin x}
  • f(x)=cosxsinxf(x) = \dfrac{\cos x}{\sin x}
  • f(x)=sinxsec180f(x) = \dfrac{\sin x}{\sec 180^\circ}

Definition: A sinusoidal function is continuous and periodic.

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