Precalculus (10th Edition)

$\approx 2.853+0.927i$
Evaluate the trigonometric expressions using a calculator, then simplify to obtain: $3\cdot (\cos (\frac{\pi}{10})+i\cdot \sin(\frac{\pi}{10})) \\=3(0.9510565163+i\cdot0.3090169944) \\\approx2.853+0.927i$