why does the power rule for differentiation doesn't apply to a function like y = x^(cosx)?
how do you solve y = x^(cosx)
hmm...
Another way to use the same idea is if you have , then just take the natural log of both sides and use the fact that if y is a function of x. You can say in general I think that (there's some conditions on that of course). That's the way I liked doing this problems.