Question

Find the angle Q if it increases as fast as its sine

Answer 1

Q,,,,, Sin Q

rate of increase:   dQ/dt   and   dSinQ / dt
=>    dQ/dt  =  Cos Q * dQ/dt
=>  Either dQ/dt = 0   or   Cos Q = 1
=>  Q = constant  or    Q = 0°

ans:  Q = 0°