6. A wave is travelling in a string. The displacement y (in in.) as a function of the time t (in s) from its equilibrium position is given by y = A cos(2n/T)t. T is the period (in s) of the motion. If A=0.200 in and T=0.100 s, sketch two cycles of y vs t. 7. Sketch the graph of y = 2 sin x + cos 2x by addition of ordinates. 8. Use a calculator to display the Lissajous figure for which x = sin nt and y = 2cos2nt. 9. Sketch two cycles of the curve of a projection of the end of a radius on the y-axis. The radius is of length R, and it is rotating counter-clockwise about the origin at 2.00 rad/s. It starts at an angle of n/6 with the positive x-axis. 10. Find the function of the formy = 2 sin bx if its graph passe@throug (It/3,2) and b is the smallest Page possible positive value. Then graph the function