Deriviates: Interval of Increase / Decrease Using a Trigonometric Function

Thanks to all of you who support me on Patreon. You da real mvps! $1 per month helps!! :) / patrickjmt !! Interval of Increase / Decrease Using a Trigonometric Function

[@monikiheyns5031]

Your videos are always of great help, thanks! Maybe I'm being weird, and you totally can just brush this off, but I find the sound of the sharpie unbearable at times which often results in me watching these videos with the sound off. If you can maybe use a less "scratchy" pen? Maybe?

[@dinfine5s266]

ok let me tell you to do it in a faster way: Instead of checking the sign in every interval you could first simply plot those points on a number line in ascending order and then check the sign of f'(x) in that interval and quickly substitute + and - in subsequent intervals.

[@PiyushKumar-hz7jp]

yes

[@krushnachandra4903]

oh so we can just use the wavy curve methods in the same way we use in finding domain of the polynomial.

[@leonardoperez9893]

You're the best thank you so much!

[@MrStratocasterguy]

I have a midterm on this tomorrow! LOL thanks!

[@patrickjmt]

Good luck! Study hard!

[@smithonme1888]

I think I’m the only one who likes the sound of a sharpie on paper.

[@kiran9536]

Thankyou ❤❤❤❤

[@dhananjayjadhav9609]

Great sir 👍 👍👌👌

[@patrickjmt]

thank ya!

[@dhwanitrathor7961]

plz plz plz explain that in the question we have taken close interval [0 to 2π] but when we found critical points we used (0 to 2)

[@Ezee.Money.U]

Why all of them use the same marker🤔🤨

[@zynga512]

Could You please do very difficult integration problems ?

[@emmadabdelkrim3073]

mr patrick i am from anohter country i would be gratful if you do videos about transformatons in complex numbers

[@thanaa4149]

Why don't you learn any program language? i think you gonna like it , and thank for the video.

[@MyNameIsTwitted]

Can someone please solve cos(2x)-sin(2x) for me?????

[@maseeratazeen4031]

= -2(sinx+cosx) then interval??? Or increasing decreasing what should we find....???

[@PiyushKumar-hz7jp]

0

[@talebfahad8685]

Thanks Bro I'm Arabic student

[@ashsupersupersuperclassmam8999]

this vedios was ok not that much good

[@jagratishukla4673]

👎👎👎👎👎👎