Hi I have a question about partial derivatives? For example if I have a function x = r cos theta for all functions, not just for this function will dx/d theta be the inverse of dtheta/dx, so 1 divided by dx/d theta will be d theta/ dx? Please help on this partial derivative question. Thanks. also for example if i have a function x = p cosh (n) and i need to find the partial derivative dn/dx can i find the partial derivative dx/dn and do 1 divided by dx/dn to find dn/dx? Please help me on this.