y'=-arccos√x²+1

Question

Please include your solution

Answer 1

I gave you some suggestions in a previous question.

The same concerns apply here.

What is the sin of an angle the cos of which is sqrt(x² + 1)?

There is a primitive (indefinite integral) for arccos u(x) and you can look it up in a table of integrals...but I am not sure what it means in this situation.