Plug cos^2(30) into my scientific calculator

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SUMMARY

The discussion centers on calculating cos^2(30) using a scientific calculator. Participants clarify that cos^2(30) represents (cos(30))^2, which is the square of the cosine of 30 degrees, rather than cos(30*30). To compute this, users must first find the cosine of 30 degrees and then square that result. This distinction is crucial for obtaining the correct answer.

PREREQUISITES
  • Understanding of trigonometric functions, specifically cosine.
  • Familiarity with scientific calculator operations.
  • Basic knowledge of exponentiation in mathematical expressions.
  • Ability to convert degrees to radians if necessary for calculator settings.
NEXT STEPS
  • Learn how to use a scientific calculator for trigonometric functions.
  • Study the properties of trigonometric identities, particularly cosine.
  • Explore the concept of squaring numbers and its implications in trigonometry.
  • Review angle conversion techniques between degrees and radians.
USEFUL FOR

Students, educators, and anyone needing to refresh their knowledge of trigonometry and scientific calculator usage.

starfish794
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How would I plug cos^2(30) into my scientific calculator to get the right answer? Thanks.
 
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What does cos^2(30) mean? :smile:
 
I don't remember, its been years since I've done that kind of math.
 
Well, then, look it up in a math book.

Hint: What does ^2 mean in the expression?
 
Last edited:
There is a distinct difference between cos T^2 and cos^2 T. (Pretend that T=the angle.) Your problem asks for cos^2 T, or (cos T)^2 (calculator form). This means (cos T)(cos T), rather than cos (T*T).
 

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