Cosine and Sine Integrals

    x       actual        ci(x)       actual        si(x) 
  0.10    -1.727868    -1.727868     0.099944     0.099944
  0.20    -1.042206    -1.042206     0.199556     0.199556
  0.60    -0.022271    -0.022271     0.588129     0.588129
  0.70     0.100515     0.100515     0.681222     0.681222
  1.80     0.456811     0.456811     1.505817     1.505817
  1.90     0.441940     0.441940     1.557775     1.557775
  2.00     0.422981     0.422981     1.605413     1.605413
  2.10     0.400512     0.400512     1.648699     1.648699
  2.20     0.375075     0.375075     1.687625     1.687625
  3.30     0.024678     0.024678     1.848081     1.848081
  6.30    -0.019888    -0.019888     1.418174     1.418174
  6.40    -0.004181    -0.004181     1.419223     1.419223
  6.50     0.011102     0.011102     1.421794     1.421794
  6.60     0.025823     0.025823     1.425816     1.425816
 10.00    -0.045456    -0.045456     1.658348     1.658348
 12.50    -0.011408    -0.011408     1.492337     1.492337
 15.00     0.046279     0.046279     1.618194     1.618194