Write the equation of the tangent function with a period of `2pi/5`  and a vertical shift of 2 units up, and write the equation of the sine function with an amplitude of 1/7, a period of `2 pi`,...

Write the equation of the tangent function with a period of `2pi/5`  and a vertical shift of 2 units up, and write the equation of the sine function with an amplitude of 1/7, a period of `2 pi`, a phase shift of `6 pi`, and a vertical shift of 10 units up.

Asked on by dolly12

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txmedteach | High School Teacher | (Level 3) Associate Educator

Posted on

I'll answer the question about tangent functions, as the questions posted right before this one will show you how to directly solve this for sine.

Working with tangents is not much different from working with sines and cosines. The only difference, really, is that the tangent does not have an amplitude. The canonical form of the equation remains the same:

`f(x) = atan(b(x-phi))+c`  

Here, determines the vertical stretch of the graph, b determines the horizontal stretch, `phi` determines the phase shift, and c determines the vertical shift.

Because we are concerned mainly about the period and vertical shift, we will look into those more exactly. The vertical shift is exactly c, no equations or change to worry about. The period has a different formula:

`T = (2pi)/b`

So, let's solve for the desired b now:

`(2pi)/5 = (2pi)/b`

`b=5`

Given our vertical shift of 2, it is clear that c = 2. Because we are not given any other information, we will set a = 1 and `phi` = 0. This gives us our final equation:

`f(x) = tan(5x)+2`  

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