Verifying Sum Difference Formula Results

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SUMMARY

The forum discussion centers on the verification of the sum difference formula for sine, specifically the calculation of \(\sin(30^\circ + 45^\circ)\). The user correctly applies the formula \(\sin A \cos B + \cos A \sin B\) using known values from special triangles, resulting in \(\frac{\sqrt{2} + \sqrt{6}}{4}\). The verification confirms the accuracy of the calculations, with community members affirming the result as correct.

PREREQUISITES
  • Understanding of trigonometric identities, specifically the sine addition formula.
  • Familiarity with special triangles and their corresponding sine and cosine values.
  • Basic algebra skills, including rationalizing denominators.
  • Knowledge of degrees and their conversion to radians, if necessary.
NEXT STEPS
  • Study the derivation of the sine addition formula in trigonometry.
  • Explore the properties of special triangles, particularly 30-60-90 and 45-45-90 triangles.
  • Practice rationalizing denominators with various algebraic expressions.
  • Learn about the unit circle and its application in trigonometric functions.
USEFUL FOR

Students studying trigonometry, educators teaching mathematical concepts, and anyone looking to verify trigonometric calculations and identities.

aisha
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Using the sum difference formula I got the following

[tex]\sin(30 degrees +45 degrees)=sin 30 cos45+cos 30 sin 45[/tex]

I used the special triangles and got

[tex](\frac {1}{2})(\frac {1}{\sqrt2})+(\frac {\sqrt3}{2}) (\frac {1}{\sqrt2})[/tex]

I rationalized the denominator and got
[tex]\frac {\sqrt2+\sqrt6} {4}[/tex]

Did i make any errors? Can someone please verify. :smile:
 
Physics news on Phys.org
Absolutely correct, well done. :smile:
 
Thanks curious :smile:
 

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