Question

Question #03833

Answer 1

`LhS=csc^(4)x-cot^(4)x`

`=(csc^2x-cot^2x)(csc^2x+cot^2x)`

`=csc^2x+cot^2x`

`=csc^2x+csc^2x-1`

`=2csc^(2)x-1 =RHS`