How to Correctly Apply the Quotient Rule in Differentiation?

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SUMMARY

The discussion focuses on the application of the Quotient Rule in differentiation, specifically for the function X / (1 + sinX). The correct derivative is derived as (1 + sinX)(1) - X(1 + cosX) / (1 + sinX)², simplifying to (1 + sinX - X - XcosX) / (1 + sinX)². A common misconception addressed is the derivative of 1 + sinX, which is indeed cosX, as the derivative of a constant (1) is zero.

PREREQUISITES
  • Understanding of basic calculus concepts, particularly differentiation.
  • Familiarity with the Quotient Rule in calculus.
  • Knowledge of trigonometric functions and their derivatives.
  • Ability to simplify algebraic expressions involving derivatives.
NEXT STEPS
  • Study the Quotient Rule in detail, including examples and applications.
  • Practice differentiating functions involving trigonometric expressions.
  • Learn about common mistakes in differentiation and how to avoid them.
  • Explore the Chain Rule and its relationship with the Quotient Rule.
USEFUL FOR

Students studying calculus, educators teaching differentiation techniques, and anyone seeking to improve their understanding of trigonometric derivatives.

DollarBill
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Homework Statement


X / 1+sinX

The Attempt at a Solution


Quotient rule

(1+sinX)(1)-X(1+cosX) / (1+sinX)2

To:

1+sinX-X-XcosX / (1+sinX)2

But when I look at the answer in the back of the book, it's wrong.
 
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Is the derivative of 1+sinX really 1+CosX? I thought the derivative of 1 was zero. ;0)
 


I always make these stupid mistakes

Thanks :biggrin:
 

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