Deriving sec^3(x^3+csc^-1(cot^3\frac{x+4}{3x})) using chain rule

In summary, the process for deriving the expression ## sec^3(x^3+csc^-1(cot^3\frac{x+4}{3x})) ## involves using the chain rule multiple times, starting with the substitution u = sec(junk inside) and then making further substitutions until all composites are eliminated. The power rule is then applied to the remaining polynomial and
  • #1
Pual Black
92
1

Homework Statement


hello
i have to derive this equation
## sec^3(x^3+csc^-1(cot^3\frac{x+4}{3x})) ##
2. The attempt at a solution

## 3sectan^2(x^3+csc^-1(cot^3\frac{x+4}{3x}))*(3x^2-\frac{1}{|cot^3\frac{x+4}{3x}|\sqrt(cot^6\frac{x+4}{3x}-1)})*(-3csc^2\frac{x+4}{3x})*(\frac{3x*1-(x+4)(3)}{9x^2})##

is it so far right?
 
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  • #2
Pual Black said:

Homework Statement


hello
i have to derive this equation
## sec^3(x^3+csc^-1(cot^3\frac{x+4}{3x})) ##
First off, it's not an equation. Second, you are differentiating the expression, not deriving it. Starting with the equation ax2 + bx + c = 0, I can derive the quadratic formula, and this has nothing to do with calculus differentiation.
Pual Black said:
2. The attempt at a solution

## 3sectan^2(x^3+csc^-1(cot^3\frac{x+4}{3x}))*(3x^2-\frac{1}{|cot^3\frac{x+4}{3x}|\sqrt(cot^6\frac{x+4}{3x}-1)})*(-3csc^2\frac{x+4}{3x})*(\frac{3x*1-(x+4)(3)}{9x^2})##

is it so far right?
Doesn't look right to me. It should start off with 3sec2(<bunch of other stuff>).

BTW, problems involving calculus should be posted in the Calculus section, not the Precalc section. I have moved this thread.
 
  • #3
Looks like you have a lot of chain rule to apply. first off make the substitution u = sec(junk inside), then du =? plugging it in ##\frac{d}{dx}f(u) = \frac{df}{du}\frac{du}{dx}## keep making substitutions until you get rid of all the composites. for example, after you make the intial substitution, you need to make another one, composed within u, say v = junk inside, then dv = ? then within v, you have another etc...
 

1. What is the derivative of sec^3(x)?

The derivative of sec^3(x) is 3sec^2(x)tan(x).

2. How do you find the derivative of sec^3(x)?

To find the derivative of sec^3(x), you can use the power rule and chain rule to simplify the expression to 3sec^2(x)tan(x).

3. Can the derivative of sec^3(x) be simplified?

Yes, the derivative of sec^3(x) can be simplified to 3sec^2(x)tan(x) using the power rule and chain rule.

4. Is the derivative of sec^3(x) the same as the derivative of 1/cos^3(x)?

Yes, the derivative of sec^3(x) is equivalent to the derivative of 1/cos^3(x). This is because sec(x) is the reciprocal of cos(x).

5. What is the second derivative of sec^3(x)?

The second derivative of sec^3(x) is -6sec(x)tan^2(x) + 3sec^3(x).

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