Derivative of sec(x) from first principles (definition)

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In this video I showed how to use the definition of the derivative to find the deriative of sec(x)
  1. Prime Newtons
  2. AB/BC
  3. AP calculus
  4. Algebra
  5. Calc1
  6. Calc2
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Комментарии
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you're very strong sir, i enjoyed your courage and smiles when explaining the concepts, thank you very much (watching from Zambia)

aphelmusonda
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I don't know if I should call you bro or teacher, bt the truth is that you are undoubtedly amazing 💯

lyricaltherapist
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i am from india i understood completely loved the video

shortsking
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Explain this better than my lecturer at University. Thank you, blessed.

PatrickEteuati
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Watching from Pakistan 🇵🇰, you are such a helpful person for student who are studying calculas after completing intermediate in medical 😅,

moamysteriesofactivities
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Excellent presentation, sir. Very helpful and encouraging.

chrisjuravich
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i was so confused thank you so much I was about to cry about this problem but you solved it so easily! ahhhh thank you!!

LexiTRexy
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very easy to understand. thank you for such a lovely video

takudzwajoezaza
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You are the exact definition of simplicity 😮

IrvinMoonga-rwul
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i noticed something: by 3:06, instead of using identities, you can just factor out (1/h)(cos(x) - cos(x+h)), and notice that this is just definition of the derivative (almost... it's negative instead) of cos(x).

So now you're left with -(-sin(x)) * lim_h->0 (1/cos(x)cos(x+h))
= sin(x) * sec^2(x)
= sec(x)tan(x)

Same can be done with the derivative of cosecant!

nanamacapagal
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I wish to know if (1-cosx)/x =0 or (cosx -1)/x =0. I am asking because you use the first relation in this video and in the video of sinx, you used the second relation. I know that you just need to multiply the second equation by -1 to solve the problem but I wish to know exactly which is the right relation…. Thanks in advance….anyway, your videos are quite good

PauloDacosta-ss
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I stumbled over a sign issue this helped me realise where I went wrong

klineoware
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Amazing amazing amazing amazing amazing amazing amazing amazing amazing amazing amazing amazing amazing amazing amazing amazing amazing 🤩

sidratulmuntaha
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sorry me ! i had already done upto last 2nd line then tore my page thinking i got it worng . then searched for this vid and wow i really am stupid

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