This in my opinion should be easy. I'm just not sure why it isn't.

The question reads,

Consider the initivial Value problem dy/dx = sin(y)

subject to Initial conditions y(X)=Y

Where X and Y are constants.

It asks us to determine the ODE's isoclines and sketch its direction field in the range x betwen [-2,2]

I normally breeze through IVP problems. But this one has me confused

normally you set y'=c a constant, to set against constant slopes

then re-arrange to leave yiso= a function

but in this case c=sin(y)

therefore yiso=sin-1(c)

which can't be what we want is it?