Sinusoids homework help

  • Thread starter Moneer81
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  • #1
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Homework Statement



Express 8.5sin(290t+325) as C1cos(wt)+C2sin(wt)


Homework Equations



The previous parts of the problem actually ask to find the wave equation itself and write it in different forms. So the above wave equation can also be expressed as 8.5cos(290t-125) or as -8.5cos(290t+55) etc.


The Attempt at a Solution



Can I use the following trig identity: A cos (wt) + B sin (wt) = (A^2 + B^2)^1/2 cos (wt + tan^-1 (-B/A)) ?
 

Answers and Replies

  • #2
Dick
Science Advisor
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It's easier than that. Use sin(a+b)=sin(a)*cos(b)+cos(a)*sin(b).
 

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