x

True solution

Numerical solution

0.07π

−0.173449822213779

−0.173880443622743

0.17π

−0.404748469382337

−0.407480685897835

0.27π

−0.596427516319343

−0.603406828812836

0.37π

−0.729724082404153

−0.741447604522964

0.47π

−0.791590171016600

−0.806147786803187

0.57π

−0.775969898356912

−0.789769859046287

0.67π

−0.684392285545858

−0.694307145831281

0.77π

−0.525821587384132

−0.530927685708137

0.87π

−0.315779808634822

−0.317328698954233

0.97π

−0.074827302049036

−0.074921135704477