x

$Exact1=\cos \left(x\right)$

$u=\cos \left(x\right)-\frac{{\pi }^2}{48}+0.2049572390$

$Error=\left|Exact1-u\right|$

0.1

0.9950042

0.9943446

0.0006595

0.2

0.9800666

0.9794071

0.0006595

0.3

0.9553365

0.9546770

0.0006595

0.4

0.9210610

0.9204015

0.0006595

0.5

0.8775826

0.8769230

0.0006595

0.6

0.8253356

0.8246761

0.0006595

0.7

0.7648422

0.7641827

0.0006595

0.8

0.6967067

0.6960472

0.0006595

0.9

0.6216100

0.6209504

0.0006595

1.0

0.5403023

0.5396428

0.0006595