I'm trying to solve cos(x/2) = 1/2. Both manual methods & graphing indicate that the two smallest nonnegative solutions are 2Pi/3 and 10Pi/3. However, Maple gives me > {x = 2/3*Pi-4/3*Pi*_B2+4*Pi*_Z4}; Maple agrees that the smallest nonnegative solution is 2Pi/3. The second solution is 2Pi/3 - 4Pi/3 = -2Pi/3. This is coterminal with 4Pi/3 but it is also coterminal with the apparent correct answer 10Pi/3. But how would I know that from Maple's answer?

Please Wait...