Let f (x) be a function with the domain R and the minimum positive period 52 π, and f (x) = SiNx (0 ≤ x < π) cosx (− π < x < 0), then f (− 114 π)=______ .

Let f (x) be a function with the domain R and the minimum positive period 52 π, and f (x) = SiNx (0 ≤ x < π) cosx (− π < x < 0), then f (− 114 π)=______ .

If the period of the function is 5 π 2, we can get f (− 11 π 4) = f (− 14 π) = cos (− π 4) = 22, so the answer is: 22