This is my work so far for proving this trig identity. What should I do next? Is there anything I did wrong thus far?
cotx=tan(-(x-pi/2))
Right side:
tan(-x+pi/2)
[-tanx+tanpi/2]/[1-(-tanx)(tanpi/2)]
[-sinx/cosx+tanpi/2]/[1+(sinx/cosx)(tanpi/2)]
also, tanpi/2 is undefined... what does that do to the question?
thank you in advance!