Determine the phase angles by which vā (t) leads iā (t) and vā (t) leads iā(t), where
$$v_1(t) = 4 \sin(377t - 25^\circ) V$$
$$i_1(t) = 0.05 \cos(377t - 20^\circ) A$$
$$i_2(t) = -0.1 \sin(377t - 45^\circ) A$$
vā leads iā by
vā leads iā by