It doesnt seem to work when I have no idea why?
Here's a challenge: for the function , find a polynomial of degree 3 (ie a cubic) approximation for y on the interval from one trough to one peak (about the main original point of inflection) - eg for that interval would be
Express the answer in the form , where p, q , r and s are in terms of a, b, c and d.
Hi, basically you find the approximation using certain points of the sine curve so that there is exactly enough to solve for a, b, c and d. (this is giving it away a bit but I used the point of inflection and one of the stationary points). Never mind my earlier post about it not working when c was not zero, I made a mistake in the formula but fixed it now