Deriving equations involving sin and cos

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SUMMARY

The discussion focuses on deriving equation (2) from equation (1) involving trigonometric functions. Equation (1) is defined as d=(tsin(2i))/((n^2-sin(i)^2)^1/2), while equation (2) is n=sin(i)(((2tcos(i/d))^2+1)^1/2). A user expresses difficulty in starting the derivation process, prompting suggestions from others to square equation (1) and manipulate it accordingly. The key step involves using algebraic manipulation and trigonometric identities to facilitate the derivation.

PREREQUISITES
  • Understanding of trigonometric identities, specifically sine and cosine functions.
  • Familiarity with algebraic manipulation techniques, including squaring equations and isolating variables.
  • Knowledge of square root operations and their properties.
  • Basic understanding of how to work with equations involving multiple variables.
NEXT STEPS
  • Research trigonometric identities and their applications in equation derivation.
  • Learn about algebraic manipulation techniques for solving complex equations.
  • Study the properties of square roots and their role in simplifying equations.
  • Explore examples of deriving equations in trigonometry to gain practical insights.
USEFUL FOR

Students studying trigonometry, educators teaching mathematical derivations, and anyone looking to enhance their skills in manipulating equations involving sine and cosine functions.

thezac11
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Homework Statement



I'm asked to derive equation(2) from equation(1).

equation(1): d=(tsin(2i))/((n^2-sin(i)^2)^1/2)

equation(2): n=sin(i)(((2tcos(i/d))^2+1)^1/2)


Homework Equations





The Attempt at a Solution



My attempts have got me nowhere, and I don't know how to even start to derive these equations. Any help would be greatly appreciated.
 
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hi thezac11! :smile:

(have a square-root: √ and try using the X2 icon just above the Reply box :wink:)

start by squaring (1), and multiplying it by (n2-sin2(i)) :wink:
 

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