PDE - Complex numbers

  • Thread starter Larrytsai
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  • #1
Larrytsai
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Homework Statement


Simplify the expression

e^(i6theta)[ (1+e^(-i10theta))/(1+e^i2theta)]

Answer should be in terms of cosines

but i dont know how to start this problem? :S

Also, does e^(-iwt) = - coswt -jsinwt?

K so Im thinking about Eulers formula, and I get an expression with Sines and cosines not just cosines =s
 
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Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
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Hi Larrytsai! :smile:

(hav a theta: θ and try using the X2 icon just above the Reply box :wink:)

hint: use Euler's formula and standard trigonometric identities to simplify 1 + e2iθ :wink:

(oh, and e-iθ = cosθ - isinθ)
 

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