A "saw-tooth" wave is a periodic wave that rises linearly upward and then drops sharply. In music, such waves are generated in digital synthesizers to give high-quality sound without distortion. Given, f(x)=121[sin x1+sin 2x2+sin 3x3+...] Graph the first four terms of the function on the window [4, 4, 1] by [1, 1.5, 0.5]