## Precalculus (6th Edition) Blitzer

Step 1. Rewrite the function as $y=sin2(x+\frac{\pi}{4})$ Step 2. Using transformation, start from $y=sin(x)$ and first shift the curve left by $\frac{\pi}{4}$; then shrink horizontally by a factor of 2 to obtain the red curve. Step 3. Present the curve over the interval $[0,2\pi]$ as shown in the figure.