Question: rotate a graph through a given angle

Here is my working so far

S1:=unapply(u*FresnelS(u)+((1/Pi)*cos((1/2)*Pi*u^2))-(1/Pi),u);

C1:=unapply(u*FresnelC(u)-((1/Pi)*sin((1/2)*Pi*u^2)),u);

with(plottools);

with(plots);

u0:=sqrt(0.25);

evalf(FresnelC(u0)+FresnelS(u0)*cot((3*Pi)/8));

p1:=display(plot([FresnelC(u),FresnelS(u),u=0..u0]));

p2:=display(plot(x-0.5191572775,x=0..1,y=0..1,colour=black));

display(p1,p2);

On the graph displayed the angle between the line and x axis is 3*pi/4 so basically I want to flip the curve about 3*pi/8 so I have a curve joining both the x axis and the line.

 

 

 

 

 

 

 

 

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