Know that the equation of our curve L is{x=+1(1≥0)y =4t-t,(①)The convexity of L is discussed.()Point (-1,0)lead the tangent line of L,find the tangent point (xo,yo),and writethe equation of the tangent line;(i)Find the area of the plane shape bounded by this tangent line with L(the partcorresponding to x≤xo)and the X-axis.