What is the product of 65(cos(14°) + i sin(14°)) and 8(cos(4°) + i sin(4°))?

To multiply complex numbers in trigonometric form, multiply their magnitudes and add their angles. The magnitude is 65 × 8 = 520, and the angle is 14° + 4° = 18°. Therefore, the product is 520(cos(18°) + i sin(18°)), choice C.

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