What is the angle between the lines y=3x+1y = 3x + 1y=3x+1 and y=−2x+5y = -2x + 5y=−2x+5?
arctan(1)\arctan(1)arctan(1)
arctan(5)\arctan(5)arctan(5)
arctan(2)\arctan(2)arctan(2)
arctan(1/2)\arctan(1/2)arctan(1/2)