Question

Question #de3ed

Answer 1

`LHS=cotx-2cot2x`

`=1/tanx-2/(tan2x)`

`=1/tanx-2/((2tanx)/(1-tan^2x))`

`=1/tanx-(1-tan^2x)/tanx`

`=(1-1+tan^2x)/tanx`

`=tan^2x/tanx=tanx=RHS`