Browse Questions

# The period of $\sin ^4 x+\cos ^4x$ is :

$\begin {array} {1 1} (1)\;\frac{\pi^4}{2} & \quad (2)\;\frac{\pi^2}{2} \\ (3)\;\frac{\pi}{4} & \quad (4)\;\frac{\pi}{2} \end {array}$

$(4)\;\frac{\pi}{2}$