Express in unit-vector notation the following vectors, each of which has magnitude 17.0 cm. (a) Vector $\overrightarrow{\mathbf{E}}$ is directed $27.0^{\circ}$ counter clockwise from the positive $x$ axis. (b) Vector $\overrightarrow{\mathbf{F}}$ is directed $27.0^{\circ}$ counterclockwise from the positive $y$ axis. (c) Vector $\overrightarrow{\mathbf{G}}$ is directed $27.0^{\circ}$ clockwise from the negative $y$ axis.