(b) The cosine of the solar zenith angle is given by cos 8 = sin d sin a + cos ocos 6 cosw (1) where o is the zenith angle, $ is the latitude, & is the declination angle, and w is the hour angle. Simplify Eq. (1) for the equator and the poles, and use your simplified expressions to show that the seasonal variations in insolation are more dramatic at the poles than at the equator in the following two aspects: (i) the intensity of sunlight at solar noon, (5 marks] (ii) the number of daylight hours. [5 marks]