For \(z = 90^\circ\), \(\sin(180^\circ) = 0\) and \(\cos(90^\circ) = 0\), so it satisfies.

For \(z = 90^\circ\), \(\sin(180^\circ) = 0\) and \(\cos(90^\circ) = 0\), so it satisfies. - Sterling Industries

📅 April 18, 2026 👤 scraface

Apr 18, 2026

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