I don't know this one:
Use substitution it says, but then ? Then what? Please
You see there's me being stupid again thinking d/dz z^2 = 2, of course it isn't! my brain sometimes, seriously :S
Yeah I get that I just miscalculated what I was thinking of. Thanks for putting me back in my place lol.
so y(t) = tan(t+c) - t, that is the final solution? that's what I have.