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\[4\left(\cos(121^{\circ}) + i\sin(121^{\circ})\right)\cdot4(\cos(75^{\circ})+i\sin(75^{\circ}))\] \[16\left(\cos\left(\frac{121\pi}{180}\right)+i\sin\left(\frac{121\pi}{180}\right)\right)\cdot\left(\cos\left(\frac{75\pi}{180}\right)+i\sin\left(\frac{75\pi}{180}\right)\right)\] \[16 e^{\frac{121\pi}{180}i} \cdot e^{\frac{75\pi}{180}i} \] \[16e^{\frac{\pi i}{180}(121+75)}\] \[16e^{\frac{196i\pi}{180}} = 16e^{\frac{49i\pi}{45}} \]
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Sat, 18 Nov 2017 18:29 GMT