Suppose that, during an experiment, the temperature of a substance in degrees Celsius at time t may be modeled by the equation $C(t)=\sin(2t)+\cos(t)$. Find all values of t for which the temperature of the substance is equal to $0^\circ$ Celsius. [Hint: Start by drawing a sketch of C(t).]
where $n$ is any integer, and all base angles are between $0$ and $2\pi$.

Use radian measure and enter your answers using at least four significant digits.