Simplifying after applying chain rule

In summary, the chain rule in calculus is a fundamental rule that allows us to find the derivative of a composite function. To simplify after applying the chain rule, one can use algebraic techniques or trigonometric identities. It is important to simplify after applying the chain rule to express the derivative in a more elegant form and make connections between different functions. Simplifying after applying the chain rule is also possible for higher order derivatives, but may require multiple applications of the chain rule. Common mistakes when simplifying after applying the chain rule include forgetting to multiply by the derivative of the outer function, incorrectly applying the power rule, and making algebraic errors. Regular practice and careful checking can help avoid these mistakes.
  • #1
en bloc
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Homework Statement



http://images.calcchat.com/solutionart/etf5e/03/d/se03d01063.png

Homework Equations





The Attempt at a Solution


I get to the third row, but can't simplify (Sin2θ)(Cos2θ). I'm looking at the trigonometric double angle formulas, and still can't figure out how the final answer came to be 1/2(Sin4θ)
 
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  • #2
2sin(x)cos(x) = sin(2x) .

That should help.
 

Related to Simplifying after applying chain rule

What is the chain rule in calculus?

The chain rule is a fundamental rule in calculus that allows us to find the derivative of a composite function. It states that the derivative of a composite function is equal to the derivative of the outer function multiplied by the derivative of the inner function.

How do you simplify after applying the chain rule?

To simplify after applying the chain rule, you can use algebraic techniques such as factoring, combining like terms, and simplifying fractions. You can also use trigonometric identities or logarithmic rules to simplify further.

Why is it important to simplify after applying the chain rule?

Simplifying after applying the chain rule allows us to express the derivative in a more simplified and elegant form. This makes it easier to understand and work with in further calculations. It also allows us to identify patterns and make connections between different functions.

Can you simplify after applying the chain rule for higher order derivatives?

Yes, you can simplify after applying the chain rule for higher order derivatives. The process is the same as for first derivatives, but you may need to apply the chain rule multiple times depending on the order of the derivative.

Are there any common mistakes when simplifying after applying the chain rule?

Yes, there are several common mistakes that can occur when simplifying after applying the chain rule. These include forgetting to multiply by the derivative of the outer function, incorrectly applying the power rule, and making algebraic errors. It is important to carefully check your work and practice regularly to avoid these mistakes.

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