1) Find the area enclosed by the curve x=3+cos(t) and y=4sin(t). My tutor gave me a hint which confuses me. A=-4 integral y dx where the upper limit is pi/2 and the lower limit is 0. I do not understand the -4 part. why must we multiply the integral by -4? 2) Find the volume of the solid generated by revolving about the y-axis the area between the first arc of the cycloid x=t-sin(t), y=1-cos(t) and the x-axis. Use the shell method. v=2pi integral xy dx =2pi integral (t-sin(t)) (1-cos(t))^2 dt I'm stuck at this point.