1. The problem statement, all variables and given/known data The angle of a pendulum is θ(t)=(0.270rad)cos(4.00t+1.00π), where t is in seconds. Determine the initial angular velocity. 2. Relevant equations ω=2πf 3. The attempt at a solution I solved for the frequency, which was 6.37E-1 Hz and subbed it into the formula above and got 4rad/s which is the same ω in the equation but it is wrong. Am I missing something because I can't figure out what is wrong with my method.