`cosec xcot x`

Explanation

माना `y= cosec xcot x`
`rArr (dy)/(dx)=(d)/(dx)(cosecxcot x)`
`=cosec x(d)/(dx)cotx+cotx(d)/(dx)cosec x`
`=cosec x(-cosec^2x)+cot x(-cosecx cot x)`
`=-cosec^3x-cosec x cot^2x`