Singuler noktadan kastettiğin $f$ fonksiyonunun tanımsız olduğu noktalar ise cevap aşağıdaki gibidir.
$$\mid \{x\mid sin2x-cos2x=0, x\in [0,2\pi]\}\cup \{x\mid cos3x=0, x\in[0,2\pi]\}\mid $$
$$=$$
$$\mid \{x\mid sin2x=cos2x, x\in [0,2\pi]\}\cup \{x\mid cos3x=cos\frac{\pi}{2}, x\in[0,2\pi]\}\mid $$
$$=$$
$$\mid \{x\mid sin2x=sin(\frac{\pi}{2}-2x), x\in [0,2\pi]\}\cup \{x\mid 3x=\frac{\pi}{2}+k\pi, k\in \mathbb{Z}, x\in[0,2\pi]\}\mid $$
$$=$$
$$\mid \{x\mid 2x=\frac{\pi}{2}-2x+2k\pi, k\in\mathbb{Z}, x\in [0,2\pi]\}\cup \{x\mid x=\frac{\pi}{6}+\frac{k\pi}{3}, k\in \mathbb{Z}, x\in[0,2\pi]\}\mid $$
$$=$$
$$\mid \{x\mid x=\frac{\pi}{8}+\frac{k\pi}{4}, k\in\mathbb{Z}, x\in [0,2\pi]\}\cup \{x\mid x=\frac{\pi}{6}+\frac{k\pi}{3}, k\in \mathbb{Z}, x\in[0,2\pi]\}\mid $$
$$=$$
$$\mid \{...\}\mid$$
$$=$$
$$...$$
bulunur.