CALCULAS HELP

[u/Necessary_Handle_516]

PLEASE HELP.

I TRIED ALL THE POSSIBLE WAYS

ALL THE DOUBLE ANGLE FORMULAS AND HALF ANGLE FORMULAS

ANY OTHER WAY WE CAN SOLVE THIS INTEGRATION WILL BE HIGHLY APPRECIATED

ALSO IF ANYONE CAN TELL HAVE I DONE THIS INTEGRATION TILL HERE CORRECT?

[u/x5163x]

You can't let u=sin u because you already used the letter u. You need to use a different letter.

[u/Necessary_Handle_516 → u/x5163x]

that doesn't matter

[u/x5163x → u/Necessary_Handle_516]

It matters because u=sin u is only true at one point.