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Help 44,45

NotSoSmart  May 8, 2018
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44.

 

We have that    y  = Acos (Bθ)

If the max is 4  and the minimun  is -4, the amplitude   =  4  =  A

 

To find  B, we can solve this

 

2pi / (2pi / 3)  = B

 

3 * 2pi  / 2pi  = B

 

3  = B

 

So....the function is

 

y   = 4 cos 3θ

 

 

45.  tan  3pi/4   =   - tan pi/4  =    -1

 

 

cool cool cool

CPhill  May 8, 2018

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