According to the linear equation, if a straight line passes through the left focus and the slope is root number 3, that is, ∠MF 1F2=60 degrees, ∠ mf 1 = 30 degrees, △MF 1F2 is a right triangle, and F 1F2=2c, then . (2a-c) 2+C2 = 4c 2 of the double pythagorean theorem

You should know how to do the rest. The final answer is the root number 3 minus 1. It should be right.