x

Exact value [27]

Standard VPM

VPM with h

0.1

0.9983358

0.7845924

0.9983358 (h = −0.3)

0.5

0.9598391

−4.8786617

0.959838 (h = −0.35)

1

0.8550576

66.787236

0.8550575 (h = −0.355)