Chapter 1: Problem 56
Trigonometric ldentities Let f(x)=\sin x+\cos x (a) Graph \(y=f(x)\) . Describe the graph. (b) Use the graph to identify the amplitude, period, horizontal shift, and vertical shift. (c) Use the formula \(\sin \alpha \cos \beta+\cos \alpha \sin \beta=\sin (\alpha+\beta)\) for the sine of the sum of two angles to confirm your answers.