Graphing the Cosine Function with a Phase Shift

[@leagueof1vs178]

at 6:00 you sir graphed from pie/4 to -pie/4.. shouldn't you go from pie/4 to 0 before getting to -pie/4 ??

[@brianmclogan]

yes, great catch

[@iagnwh]

Dude you should be getting a huge community service award! thank you so much

[@lilwayne1994]

The fact that it was 8 years ago and it still helps people means a lot about his teaching🤘🏽🤘🏽🤘🏽

[@brianmclogan]

no biggie! happy to help you out

[@nqobileportia6792]

Free Math Videos

[@brianmclogan]

barely, the satisfaction of helping is worth a lot

[@johnnhuang]

thank you, i will pass my test tmrw because of this

[@theclashbros9687]

Why is it a reflection over the x-axis?

[@brianmclogan]

because it is multiplied by -1

[@jamiewalcheski5952]

I started to notice in some videos you have a start and end points and other videos you only look for starting point and allowing you period as an end point. I am not sure why your utilizing two different concepts. Can you fill me in?

[@MerhabaBenYasin]

Wouldn't the end point be 9pi/4 because 2+1/4=9/4, or in the decimal form 2.25? Great videos btw! You're a life saver, thank you for what you do Mr. McLogan!

[@brianmclogan]

yes I believe I corrected in on the video

[@RanZR303]

I love you !!!!!

[@brianmclogan]

happy to be able to help

[@hidayafathi5692]

Thnx, thnx and thnx

[@uriel528]

Hi, just verifying because I am coming out with different but isn't 2 pi + pi/4 = 9pi/4? In the video you have that it came out to 5pi/4

[@raulguajardo249]

uriel528 he fixed it

[@raminrasouli191]

End point is 9pi/4 not 5pi/4. And as usual you forgot to reflect about the x - axis.