Solving a Degree/Radian Function: f(t) = 42cos(2t + 93°)

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Homework Help Overview

The problem involves evaluating the function f(t) = 42cos(2t + 93°) at a specific time, with t measured in seconds. The original poster is attempting to calculate f(808ms) but is encountering difficulties with their results.

Discussion Character

  • Exploratory, Mathematical reasoning, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the need to convert milliseconds to seconds and question the separation of the cosine argument in the calculations. There are attempts to recalculate the function without separating the argument, leading to different results.

Discussion Status

There is ongoing dialogue about the correct approach to the problem, with some participants suggesting a reevaluation of the calculations. Multiple interpretations of the steps taken are being explored, but there is no clear consensus on the correct answer yet.

Contextual Notes

Participants are working under the constraints of the problem statement and are focused on ensuring the correct conversion of units and the proper handling of the cosine function's argument.

mwhowell
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Homework Statement



f(t) = 42cos(2t + 93°), where t is measured in seconds

f(808ms) =



Homework Equations





The Attempt at a Solution



42cos(2t)+42cos(93^o^)=
42cos(1616)+42cos(1.62)=
1200.92+1.2=
but that's wrong..help!
 
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First, convert ms to s. Second, why are you separating the cos argument?
 
i convert from ms to s then do it out again but without separating the argument. i get -1.29 which is still wrong.
 
-41.8 is the answer you should have gotten, correct? I'm not sure where you would have gotten -1.29.
 
mwhowell said:
i convert from ms to s then do it out again but without separating the argument. i get -1.29 which is still wrong.

Show your steps. It is hard to say anything without just writing down the solution when the only information you give is that you get the wrong answer.
 

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