Differentiation of Trigonometric functions

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SUMMARY

The discussion focuses on differentiating the function y = tan²(3x - 2) and finding its derivative dy/dx. The correct derivative is established as 6*tan(3x - 2)*sec²(3x - 2), which arises from applying the chain rule and the derivative of the tangent function. Participants clarify the misunderstanding regarding the use of sec(3x - 2) instead of sec²(3x - 2) in the derivative expression.

PREREQUISITES
  • Understanding of basic calculus concepts, specifically differentiation.
  • Familiarity with the chain rule in calculus.
  • Knowledge of trigonometric functions and their derivatives, particularly tangent and secant.
  • Ability to manipulate algebraic expressions involving powers and functions.
NEXT STEPS
  • Study the chain rule in calculus for more complex function differentiation.
  • Learn about the derivatives of trigonometric functions, focusing on tan(u) and sec(u).
  • Practice differentiating composite functions to reinforce understanding of the topic.
  • Explore applications of derivatives in real-world scenarios, such as physics and engineering.
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Students studying calculus, mathematics educators, and anyone seeking to improve their understanding of trigonometric differentiation techniques.

MaxManus
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Homework Statement


Let y = tan2(3x-2)
Find dy/dx


The solution is:
2*tan(3x-2)*sec(3x-2)*3
= 6*tan(3x-2)*sec2(3x-2)

Why is it not:
6*tan(3x-2)*sec(3x-2)

I am thinking:
y = (tan(3x-2))2
take the power 2 down,multiply with the parentes multiply with the defferentiated parentes

Edit: Happy new year
 
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happy new year!

MaxManus said:
Let y = tan2(3x-2)
Find dy/dx

Why is it not:
6*tan(3x-2)*sec(3x-2)

I am thinking:
y = (tan(3x-2))2
take the power 2 down,multiply with the parentes multiply with the defferentiated parentes

Hi MaxManus! Happy new year! :smile:

(what are parentes? :confused: do you mean "parenthesis"?)

y = (thing)2,

so y' = 2(thing)(thing') …

in this case, the thing is a tan, and tan' = sec2 :wink:
 
What do you think d(tan(u))/dx is equivalent to?

Edit: tiny-tim beat me to it.
 
happy new year!

jgens said:
Edit: tiny-tim beat me to it.

na na na na-na! :-p

hic! :redface:

:smile: happy new year! :smile:
 
Happy new year! :)
 
Thanks tiny-tim and jgens.
Yes, I ment parenthesis, but I could not spell it.
 
Hitting the champagne a little early?
 

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