The two vectors vec(a) and vec(b) in the figure have equal magnitudes of 13.9 m and the angles are \theta _(1)=26\deg and \theta _(2)=100\deg . Find (a) the x
component and (b) the y component of their vector sum vec(r), (c) the magnitude of vec(r), and (d) the angle vec(r) makes with the positive
direction of the x axis.