`f(x) = cot(x)/sin(x)`

`f'(x) = [sin(x)*{-cosec^2(x)} - cot(x)*cos(x)]/{sin^2(x)}`

`or, f'(x) = [-cosec(x) - cot(x)*cos(x)]/{sin^2(x)}`

``

`f(x) = cot(x)/sin(x)`

`f'(x) = [sin(x)*{-cosec^2(x)} - cot(x)*cos(x)]/{sin^2(x)}`

`or, f'(x) = [-cosec(x) - cot(x)*cos(x)]/{sin^2(x)}`

``