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The problem states:

Express Cos( Θ

I'm really confused by

I'm really lost, someone please steer me in the right direction.

Thanks,

Frank

Edit: Not sure what's wrong with my &theta ?

Express Cos( Θ

_{1}+ Θ_{2}+ Θ_{3}) in terms of Sin(Θ_{k}) and Cos(Θ_{k}), k = 1, 2, 3, using the relation e^{+/-i*Θ}= Cos(Θ) +/- i*Sin(Θ). [*Hint: Use the product property of the exponential e.g., e*]^{(Θ1 + Θ2)}= e^{i*Θ1}e^{i*Θ2}.I'm really confused by

**, how does this apply to the problem?***in terms of Sin(Θ*_{k}) and Cos(Θ_{k}), k = 1, 2, 3I'm really lost, someone please steer me in the right direction.

Thanks,

Frank

Edit: Not sure what's wrong with my &theta ?

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