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

[mwhowell]

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!

 

[p21bass]

First, convert ms to s. Second, why are you separating the cos argument?

 

[mwhowell]

i convert from ms to s then do it out again but without separating the arguement. i get -1.29 which is still wrong.

 

[p21bass]

-41.8 is the answer you should have gotten, correct? I'm not sure where you would have gotten -1.29.

 

[Inferior89]

i convert from ms to s then do it out again but without separating the arguement. 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.