Question

Question #6b048

Answer 1

`LHS=cot2x`

`=(cos2x)/(sin2x)`

`=(cos^2x-sin^2x)/(2sinxcosx)`

`=(cos^2x/cos^2x-sin^2x/cos^2x)/((2sinxcosx)/cos^2x)`

`=(1-tan^2x)/((2sinx)/cosx)`

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

Proved