質問: Question #9a76f ===============
回答: #=2# #### Explanation: #((1-cosx)^2+sin^2x)/(1-cosx)# #=(1-2cosx+cos^2x+sin^2x)/(1-cosx)# #=(1-2cosx+1)/(1-cosx)# #=(2(1-cosx))/(1-cosx)# #=2#