The Student Room Group
Reply 1
cot2x+1csc2x.\cot^2x + 1 \equiv \csc^2x.
Reply 2
cotx=cosec²x -7

remem : cosec²x = 1 + cot²x
therefore
cotx=cosec²x -7
cotx= 1 + cot²x -7
cot²x - cot x - 6
(cotx+2)(cotx-3)=0
tanx = - .5 or tanx= 1/3
thanks :smile:
Reply 4
Hi could you please tell me which year this question is from