Understanding Trig Identities
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- Опубліковано 11 чер 2012
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Trigonometric Identities: This tutorial will teach you to identify the basic trigonometric identities and how to apply them.
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This was a good tutorial. Thank for step by step. My teacher skips the algebra steps because she assumes we remember that algebra. She never explains how she gets from one step to another. Again, great tutorial!
NEW BEST FRIEND....Why does UA-cam work more than my teacher
haha so true😂
+Alecsys Else EXACTLY. My tuition for school could've just been donated to these hardworking UA-cam teachers. My teachers at school really sucks and don't even know how to make student understand the lesson well.
Thanks for the motivational speech halfway, I needed that greatly. Your tutorial is excellent. Thank you very much for taking your time to thoroughly explain this concept !
Mind just blown! This video helped me more then Khan Academy. Thank you for this video.
Thank you, thank you! This really made clear to me what I was having trouble understanding :-)
Thanks for the video m8, im actually starting to grasp this now.
This video is so incredibly helpful!
This video was actually really helpful ! Thanks so much!!!!
Thank you so much I wanted to understand these and now i'm starting to!!!
you teach a lot better than my teacher...thank you so much!!
THANK YOU SO MUCH!!!!
really helpful: thanks you, i just worked along as you taught, thanks
AHAHAHAHAH
Cool, thank you very much.
thanks it is really helpful
bless your soul !
this was very helpful.
I wish you did some examples for cofunction identities, because I dont know how to do them. I understood everything up to that point. for example " csc 4pie/9 = _____ ? " I cant do that. I can turn csc into 1/sinx , but thats as far as i go.
thank for this example :)
It's fun to say trigonometric.
The second example seems like it would have been easier to have just added 2sin^2x to both sides and gotten cos^2x-sin^2x+2sin^2x=1-2sin^2x+2sin^2x. This simplifies to cos^2x+sin^2x=1, the pythagorean identity.
how come your reciprocal identities is so different in the other youtube videos pertaining to trig identities and how come that also in our textbook in trigonometry that sin really is sin=1/csc cos=1/sec and tan=1/cot ? really confusing here, are there 8 reciprocal identities? because i do remember you saying that theres no identities that deals with Sin x AND COS (By the Way you said that at 6:37,while in our in trigo, There's only Three Given Reciprocal identities which is the one that i said to you and in the other videos that i come upon gives the reciprocal identities that in my textbook shows, my question is are there 8 reci identities?
Btw really nice Presentation though :)
There are only 3 reciprocal identities, as shown in this video. The other five identities are Pythagorean Identities and Tangent and Cotangent Identities. The reciprocal identities that I show in this video are identical to those in your book, sin x = 1/ csc x is the same as csc x = 1/sin x. Just use multiplication and division to move the two values around. What's important is that you understand how they relate to each other in the expression. So to answer your question, no, there are only three reciprocal identities. This video shows some of the other common trig identities that you will come across soon or that you may have already come across. Thanks for watching!
Csc^2 x (1 -cos^2x) = 1 ?
Yes, as csc^2x is really 1/sinx and (1-cos^2x) is realy sinx, the sinx's will cancel and you will be left with 1.
The question tanxcosx=sinx, could you have divided both sides by cosx to get
tanx=sins/cosx
Then have tanx=tanx??
yep, that's an identity:)