1. Determine the exact value of expression cos [tan^-1(sqrt3/3)]
2. The astrouant observe the cities which are 48km apart, angle between the lines of sight is 7.6 degree. Given that he is same distance from each, how high above surface of the earth is he?
3. Determine the measure of least positive angle which is coterminal with the angle given. Then compute meassure of the negative angle which is nearest to and is coterminal with angle given -146 degree.
4. Convert angle D^o M^' s^"
5. Determine 0 or < theta or <2pi