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For those that don't have access to the book its a question dealing with a banked curve with radius R and a angle alpha. Now there is also a friction force stoping the car from sliding of the banked curve, now my question is how do you derive the equation to explain the situation. I know for a normal banked curve without friction the answer is just, Nsin(angle) = m(v^2)/r and Ncos(angle) = mg

So therefore tan(angle) = (v^2)/rg

Now how do you derive the equation is friction is also a force helping the car sliding down, i know the answer is suppose to be vmax = (rgtan(angle + tan^-1(co-efficient of f)))