f'(x) = xcos(π/x)(-π/x^2) + sin(π/x) = (-π/x)cos(π/x) + sin((π/x) f''(x) = (-π/x)(-sin(π/x))(-π/x^2) - (π/x^2)(cos(π/x)) + cos(π/x)(-π/x^2) simplify if needed
You can ask a new question or answer this question.