Using Euler's formula e^{i θ} = cos θ + i sin θ, evaluate e^{iπ}.

Using Euler's formula e^{i θ} = cos θ + i sin θ, evaluate e^{iπ}.

• A. e^{iπ} = -1
• B. e^{iπ} = 1
• C. e^{iπ} = i
• D. e^{iπ} = -i

Answer: (A)