well your first reply to Mitch Drabenstott was equally retarded… It
doesn’t seem like rocket science because it’s used in rocket science.
Algebra is used in rocket science, that doesn’t mean that an introduction
in algebra should be as difficult as rocket science.

so here i am, 2 weeks from a major maths exam, finally understanding
derivatives. I just learned the general formulas for all the major
functions and never really quite understood what a derivative is. And I
studied derivatives 2 years ago. I can’t emphasize enough how much you’re
helping, Sal. And I also can’t stress enough how much I appreciate your
effort that you’ve put into this. Thanks! And keep at it, you’re doing an
amazing job. peace

I remeber learning all the rules of calculus in high school but never
recalled deriving it. I’m getting a small sense of how Newton or Leibniz
felt when they figured it out.

You clearly don’t know how the power rule works! The power rule is such
that if f(x) = x^n, then f’(x) = nx^(n-1). And thus, if f(x) = x^(1/2),
f’(x) = (1/2)x^(-1/2). The power rule also works such that any constants
disappear (because the slope of a line never has a constant). The reason
for this is that any constant (called a in this case) is equal to a times
x^0 (which is 1). So a = ax^0, and thus, if f(x) = a, then f’(x) = 0ax^(-1)
= 0

This guy is SOO AWESOME!!!Thanks!

easy so easy

How you write on the screen? is there special software and designated pen

and how you video the lecture ?

no! f(3) = 3^2 = 9 f ‘ (3) = 2 x 3 = 6

did you not read what i wrote

well your first reply to Mitch Drabenstott was equally retarded… It

doesn’t seem like rocket science because it’s used in rocket science.

Algebra is used in rocket science, that doesn’t mean that an introduction

in algebra should be as difficult as rocket science.

this…. is just the beginning ._.

@UdontnomeYGO Woah you’re in 7th grade and you’re learning this?? What are

teachers teaching children these days….

so here i am, 2 weeks from a major maths exam, finally understanding

derivatives. I just learned the general formulas for all the major

functions and never really quite understood what a derivative is. And I

studied derivatives 2 years ago. I can’t emphasize enough how much you’re

helping, Sal. And I also can’t stress enough how much I appreciate your

effort that you’ve put into this. Thanks! And keep at it, you’re doing an

amazing job. peace

@daggermail1 it’s an equals sign, not a minus.

I logged in to say I love you, and why aren’t you my college math teacher?

Lol

uh no he doesnt

my professor makes this seem like rocket science…this video makes it seem

easy.

class 9 student ? :O what…..yaarrrr

You really helped me by taking it that bit further and asking, ‘but what

does that mean?!’ Thanks.

Good video quality, terrible audio quality.

@Andy8Tran Yup, I definitely thought something like that too when he said

graze. high5 for sexual innuendos.

HD looks good Sal!

I think he is teaching the intuition between rules like that.

I’m SO EXCITED!

I remeber learning all the rules of calculus in high school but never

recalled deriving it. I’m getting a small sense of how Newton or Leibniz

felt when they figured it out.

You clearly don’t know how the power rule works! The power rule is such

that if f(x) = x^n, then f’(x) = nx^(n-1). And thus, if f(x) = x^(1/2),

f’(x) = (1/2)x^(-1/2). The power rule also works such that any constants

disappear (because the slope of a line never has a constant). The reason

for this is that any constant (called a in this case) is equal to a times

x^0 (which is 1). So a = ax^0, and thus, if f(x) = a, then f’(x) = 0ax^(-1)

= 0

its quite hard..

m for slope… I love ur logic (:

2x + h as h approaches 0 would be 2x + 0 or 2x.

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