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Sketch y=2cos(X-(pi/4)) between X=0 and X=2pi

Quote: Originally Posted by mwin002 Sketch y=2cos(X-(pi/4)) between X=0 and X=2pi start by sketching ... $\displaystyle y = \cos{x}$ adjust the amplitude ... $\displaystyle y = 2\cos{x}$ perform the horizontal phase shift ... $\displaystyle y = 2\cos\left(x - \frac{\pi}{4}\right)$