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