Evaluate Euler's formula e^(iθ) = cos θ + i sin θ for any angle. This fundamental identity connects exponential and trigonometric representations of complex numbers.
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Euler's formula states that for any real number θ, e raised to the power of iθ equals cos θ plus i times sin θ. It bridges exponential and trigonometric forms and is the basis for Euler's identity when θ = π.
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