Representing cos(npi/2) in general form

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The discussion centers on representing the function cos(nπ/2) in a general form. The user suggests that cos(nπ) can be expressed as (-1)^n and seeks a similar representation for cos(nπ/2). A proposed formula is (1 + (-1)^n)/2 * (-1)^(n/2), indicating a method to derive the general form for cos(nπ/2) based on the properties of cosine and its periodicity.

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nutcase21
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hi i am currently trying to solve a Fourier series question and i realize for example cos(npi) can be represented as (-1)n.

So i was wandering is there anyway to represent cos(npi/2) to a general form too?
 
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i suppose something like
(1+(-1)n)/2*(-1)n/2
 
OIC thnks.

is there any tricks to getting the general form?
 

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