b) f'(x) = -sin(x) * cos(1 + cos(x) )
c) f'(x) = 6 * (x^2 - 4)^2 * x für x >= 2, = -6 * (x^2 - 4)^2 * x für x < 2
d) f'(x) = x^(x^x) * [x^x * (log(x) + 1) * log(x) + x^x / x]
e) f'(x) = 2 * x * e^(x^5) + (x^2+1)*5*x^4*e^(x^5)
f) f'(x) = cos(x)^sin(x) * [cos(x) *log(cos(x)-sin(x)^2/cos(x)]