`intcos^-1xdx`

Explanation

`intsox^-1x.dx` [Choose cos^-1x=1st
and 1=2nd function]
=`cos^-1x.x-int(-1)/sqrt(1-xx^2) .xdx`
=`xcos^-1x+int1/sqrt(1-xx^2) .xdx`
[Put `1-x^2=t^2`
Then xdx=-tdt]
=`xcos^-1x+int(-tdt)/t`
`xcos^-1x-t+C`
=`xcos^-1x-sqrt(1-x^2) +C`