Question

How do you use the amplitude and period to graph `y = -cos ( x- pi/4)`?

Answer 1

`A=1, B=1,C=0->y=0,D=pi/4, P=(2pi)/B=2pi` Increments: `P/4=(2pi)/4=pi/2`

Explanation:

Start from the sinusoidal axis y=C which happens to be the x-axis here since sinusoidal equation is y=0. From y=0 go up one unit to y=1 and draw the upper bound then go down one unit and draw the lower bound. Your graph will start on the x-axis from `pi/4` and add `pi/2`each time to get to the next mark. Remember that you only need five points to graph one cycle of the sinusoidal equation.