Explaining steps in simplification

  • Context: High School 
  • Thread starter Thread starter exequor
  • Start date Start date
Click For Summary
SUMMARY

The discussion centers on the simplification of mathematical expressions, specifically addressing the transformation of lines in a given expression. A mistake was identified in the original lines, particularly when substituting "theta" with 15, which incorrectly equated to 1.1 instead of the expected value. The transition from line 2 to line 3 utilizes the sine summation formula, a key identity in trigonometry. Understanding these transformations is crucial for accurate mathematical simplification.

PREREQUISITES
  • Understanding of trigonometric identities, specifically the sine summation formula.
  • Familiarity with mathematical expressions and simplification techniques.
  • Basic knowledge of substitution methods in algebra.
  • Ability to interpret and analyze mathematical errors in expressions.
NEXT STEPS
  • Study the sine summation formula and its applications in trigonometry.
  • Review common mathematical identities used in simplification.
  • Practice substitution methods in algebraic expressions.
  • Analyze examples of mathematical errors and their corrections for better understanding.
USEFUL FOR

Students, educators, and anyone involved in mathematics who seeks to improve their understanding of expression simplification and error identification in mathematical transformations.

exequor
Messages
393
Reaction score
0
can someone explain to me the stages that are missing in the expression in the attached picture. i think that it has to do with identities but in the book that i got it from did not explain clearly how they went from one line to another. i will appreciate the help very much. all i am trying to do is to understand how to go from one line to the other.
 

Attachments

  • physicsexp.gif
    physicsexp.gif
    1.6 KB · Views: 538
Mathematics news on Phys.org
No wonder you're stuck; the lines contain a mistake. (Setting "theta"=15 in the last line yields 1.1=sin30)
The transformation of the righthand sides in line 2 to 3 is the sine summation formula
 

Similar threads

  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 13 ·
Replies
13
Views
3K
  • · Replies 17 ·
Replies
17
Views
2K
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 13 ·
Replies
13
Views
2K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 47 ·
2
Replies
47
Views
6K
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 3 ·
Replies
3
Views
3K