code: def dpdf(self, x):
      return 0.2 * 0.45 * (2 * np.pi) * np.cos(2 * np.pi * x)
  
imports: import numpy
  from .common import Benchmark, safe_import
label_desc: Use image node_id 3 for calling the contdist5 obj's underlying member method code with example usage: obj.dpdf(x) and returns: unknown