a) A1=3
A2=4
[tex]\phi_{1}[/tex]=[tex]\frac{\pi }{3}[/tex]
[tex]\phi_{2}[/tex]=[tex]\frac{5\pi}{6}[/tex]
b) A=[tex]\sqrt{A_{1}^{2}+A_{2}^{2}+2A_{1}A_{2}cos(\phi_{2} - \phi_{1}) }[/tex] = [tex]\sqrt{37}[/tex]≅6,08
[tex]tg\phi=\frac{A_1sin\phi_1 + A_2sin\phi_2}{A_1cos\phi_1 + A_2cos\phi_2} = \frac{3 \frac{\sqrt{3} }{2} + 4\frac{1}{2} }{3 \frac{1}{2} + 4\frac{\sqrt{3}}{2} }=\frac{36+7\sqrt{3}}{39}[/tex]≅1,23
