Question

Question #5f6db

Answer 1

`1-(tanx-cotx)/(tanx+cotx)`

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

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

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

`=1+cos2x=2cos^2x`