Given $ f(x) = 5\sin\left(\frac14 x^4\right) -\sin\left(\frac12 x\right)^4 $ Find, to 10 significant figures, the unique turning point of x[0] in the interval [1,2].
Also, I've got to get the second derivative in 10 significant figures.
The plot doesn't exactly make sense in maple, don't think I understand how to go about solving it mathematically.