What role have the Jewish people played in the history of Spain ?
If -LSB- math -RSB- 2x-y = 2 -LSB- / math -RSB- , how can I prove -LSB- math -RSB- \ sqrt -LCB- x ^ 2 + -LRB- y +1 -RRB- ^ 2 -RCB- + \ sqrt -LCB- x ^ 2 + -LRB- y-3 -RRB- ^ 2 -RCB- \ geq 2 \ sqrt -LCB- 5 -RCB- -LSB- / math -RSB- ?