Question

given h(x)= cotx/x find h'(ð/2)

Answer 1

h'(x) = (x(-csc^2 x) - cotx)/x^2

then h'(π/2) = ((π/2)(-1) - 0)/(π^2 /4)
= (-π/2) / (π^2/4) = -2/π